What dissolves in water? Highly dispersed systems (true solutions) All substances are soluble in water.

Open lesson on understanding the world

Pedagogical system: Three-dimensional methodological teaching system

Lesson topic: Water is a solvent.

Substances soluble and insoluble in water.

Lesson type : Lesson on introducing new material

1.Lesson objectives:

Educational: Formation of a holistic view of the world through observation, perception, and activity;

Introduce substances that are soluble and insoluble in water;

Learn to work with a hypothesis (assumption, through the activity method and practical approach).

Educational: Foster a sense of cooperation and mutual assistance towards each other.

Educational: Develop a conscious attitude towards the result of your educational work; develop such techniques of mental activity as comparison, classification, analysis and synthesis;

2. Lesson content:

TasksI – IIIstages are given in student workbooks and in the key- teacher's answers.

3. Lesson methods

Istage - message;

IIstage – a) “YES” or “No” test

b) self-search method

c) consolidation in practice

III

4. Shapes

Istage – frontal, individual;

IIstage – a) individual

b) frontal

c) group

IIIstage – individual

5. Visuals

Stage I – workbook, “transparent journal”, individual student journal and

teachers;

Stage II – a) slides, textbook, interactive whiteboard;

b) textbook, workbook;

C) textbook, workbook, blackboard, chalk.

Stage III - workbook, “transparent journal”, individual student journal and

teachers;

During the classes:

Stage I – Psychological attitude

The lesson begins.

It will be useful for the guys.

Try to understand everything

Learn to reveal secrets!

1. Looks like you're wearing lace

Trees, bushes, wires (slide 2)

And it seems like a fairy tale,

But, in essence, only water. (slide 3)

2. The vast expanse of the ocean (slide 4)

And the quiet backwater of the pond, (slide 5)

Cascade of a waterfall and splashes of a fountain, (slide 6,7)

And it's all just water.

3. Disappearing into the turquoise distance (slide 8)

Clouds float like swans.

Here is a thundercloud (slide 9)

But, in essence, only water.

4. White snow will fall and cover you (slide 10)

Native forests and fields.

But the time will come - everything will melt (slide 11)

And there will be plain water. (slide 12)

b ) Checking homework

1) Guys, you at home were given the task of collecting words into groups and preparing messages.

Water Fog Iceberg Ice Snow Steam

Liquid

Solid

Gaseous

Water
Fog

Ice
Snow
Iceberg

Steam

Children's messages .

Student 1.

The first of the natural resources that a person encounters in his life is water. Water becomes an inseparable companion of humanity for life from the moment of its birth until the last day. “Water,” said the great Leonardo da Vinci, “was given the magical power to become the juice of life on Earth.”

Man will somehow manage without oil, diamonds, and invent new engines, but he will not be able to live without water. People have always deified water. There is not a single people in which water is not considered the mother of all living things, a healing and cleansing force, and a source of fertility. The famous French writer - pilot Antoine de Saint-Exupery, whose plane crashed in the Sahara desert - wrote this: “Water!.. You have no taste, no color, no smell, you cannot be written, they enjoy you without knowing what are you! It cannot be said that you are necessary for life: you are life itself. You fill us with joy that cannot be explained by our feelings. With you, the forces to which we have already said goodbye return to us. By your grace, the high springs of our hearts begin to bubble within us again. You are the greatest wealth in the world...”

Student 2.

Water is the only substance that is found on Earth in three states: solid, liquid, gaseous.

If you quickly rotate the globe, it will seem that it is one color - blue. And all because there is more of this paint on it than white, green, brown. The seas and oceans of our planet are depicted in blue. Water occupies ¾ of the surface of the globe. Water is everywhere.

Water is part of any living organism. It is enough to crush a leaf of a plant in your hands, and we will find moisture in it. Water is found in all parts of plants.

There is a lot of water in the human body. Our body is almost 2/3 water. Our body needs water to remove various harmful substances. Is there a lot of water in our body? We can count: you need to divide your body weight by 3 and multiply the resulting number by 2.

For example. My weight is 33 kg, I divide by 3 and multiply by 2, I get 22 kg. This means that there are approximately 22 kg of water in my body.

Student 3.

A living organism constantly consumes water and needs to be replenished. For example, a person needs more than 2 liters of water per day (he drinks some of it, and some is contained in food).

Fields and forests drink water. Without it, neither animals, nor birds, nor people can live. But water not only gives water, but also feeds - thousands of fishing vessels sail across the seas and oceans. Water washes all people, cities, cars, roads.

Without water, you can’t knead bread dough, you can’t prepare concrete for construction, you can’t make paper, candy, or medicine—nothing can be done without water. But all this became available to man after he had thoroughly studied the properties of this substance.

b) Checking the “Bridge” task

Fairy tale "Two Donkeys"

There is such a fairy tale. Two donkeys were walking along the road with luggage. One was loaded with salt, and the other with cotton wool. The first donkey could hardly move his legs: his burden was so heavy. The second one was fun and easy.

Soon the animals had to cross the river. The donkey, loaded with salt, stopped in the water and began to bathe: he first lay down in the water, then stood on his feet again. When the donkey came out of the water, his burden became much lighter. The other donkey, looking at the first one, also began to bathe. But the longer he bathed, the heavier the cotton wool loaded onto him became.

Why

What are we going to try to learn about water today?

So , the purpose of our lesson will test the ability of water to dissolve different substances.
What can we do to achieve this goal?

- (Explore a new property of water )

How can we observe this property of water?

(Conduct experiments .)

What will be the subject of the research?(Water )

Think about how we will conduct the research? (Work in groups)

How should group members work to conduct the study successfully?

(Let's remember the rules of working in a group) Why do we need these rules?

Safety rules when conducting experiments .

Work under the guidance of an adult.

It is prohibited to get up from the workplace and walk around the classroom.

Observations, discussions, and conclusions are made jointly, respecting the opinions of everyone and members of other groups.

Name these substances.

Stage II – self-group search in the textbook for answers to leading questions given in the workbooks.

Today we will learn about the capabilities of water as a solvent. The experiments we will now conduct will help us with this.

Fizminutka

Practical part

But, Before moving on to the experiments, let's check if everything in our laboratory is ready for work?
- What substances are there to ensure the experiment is carried out in each group?

What kind of devices and tools are there?

You also have a package of instructions for conducting experiments.
Each group will conduct an experiment in accordance with the number received. Is everyone clear?

Take the form with instructions No. 1.

Read the procedure - the progress of work - at the first stage. Each group reads the work instructions only for their own experience. All clear?

What observations should be made and why?

Where do we record the results of observations?

Then draw your conclusions. Where do we write down the conclusions?

Work in groups.

Take a small amount of the substance with a spoon, add it to a glass of water and stir well. Watch what happened?

- Stir the water. Observe, what happened?

Before you lies a plan for writing a story about your observations.

Prepare a report of your observations on this plan.

1 group

What happened to the salt?

Draw a conclusion.

(The solution is transparent, no salt is visible. This means that the salt dissolves in water.)

2nd group

What kind of solution did you get? Has it changed color?

What happened to sugar?

Draw a conclusion.

(The solution is transparent, sugar is not visible. This means that sugar dissolves in water.)

3 group

What kind of solution did you get? Has it changed color?

What happened to the river sand?

Draw a conclusion.

(Sand settles to the bottom. It is visible. This means that sand does not dissolve in water)

Now let's listen to what observations each group made.

( They go to the board and attach a card with the words dissolve or not dissolve)

Let's draw a conclusion. (Water can dissolve various substances. It is a solvent. But not all substances dissolve in water.)Posted on the board

What do you call substances that dissolve in water? (Soluble)Posted on the board

What about substances that do not dissolve in water? (Insoluble)Posted on the board

I will add colored salt (copper sulfate - copper sulfate) to a glass of water. What's happening?

Do you think pebbles dissolve in water?Teacher shows experience .

What other substances can water dissolve? (sugar, citric acid, soda)

What could the substances be?

III stage – method of entering assessment according to a 12-point rating system (three-level tasks)

Level 1

1.Guess the riddles

1.Lives in seas and rivers,
But it often flies across the sky.
How will she get bored of flying?
Falls to the ground again

2. Flowing, flowing -
It won't leak
Runs, runs-
Won't run out

The wind will blow - it will tremble

2. Level

a) salt

b) juice

c) clay

d) sugar

2. Why does tea become sweet if sugar is added to it?

n) water is transparent

o) water is a solvent

p) water has no odor

3How to purify contaminated water?

d) heat

e) cool

d) filter

h) freeze

f) animals

j) plants

a) plants and factories

l) streams

Level 3

Solve the puzzles:

____________________________

Lesson summary : - Why did we do research in class?

What property of water did you learn about from experiments?

What could the substances be?

Name the soluble substances.

Name the insoluble substances.

Reflection.

I learned in class

I can praise myself for

It was difficult for me

What property of water did you use for this?

If you did a good job in class, take a blue drop, and if you didn’t do a very good job, take a yellow one. Let's attach our droplets to the board.

Look how many blue droplets we got. How much water is there on our planet? It occupies ¾ of the Earth's surface. But only 2% is fresh water. Therefore, fresh water must be conserved. Thanks to water, such beauty exists on our planet.

You all did a good job during the lesson and worked actively. They gave complete answers. Well done.

Homework: solve puzzles, create a reminder on water protection.

Appendix 3 (form 1).

Goal of the work:

Progress

Observations

Conclusion

________________________

Goal of the work: check the ability of water to dissolve different substances.

Progress

Observations

Conclusion

Pour the oil into a glass of water. Stir

wooden stick

________________________

General conclusion: __________________________________________________________________

____________________________________________________________________________________________________________________________________

Goal of the work: check the ability of water to dissolve different substances.

Progress

Observations

Conclusion

Pour river sand into a glass of water. Stir with a wooden stick.

________________________

General conclusion: __________________________________________________________________

Appendix 3 (form 2).

Goal of the work:

Progress

Observations

Conclusion

________________________

General conclusion: __________________________________________________________________

Goal of the work: find a way to purify water from insoluble substances.

Progress

Observations

Conclusion

Pour the water and cherry juice into a funnel with a filter.

________________________

General conclusion: __________________________________________________________________

____________________________________________________________________________________________________________________________________

Goal of the work: find a way to purify water from insoluble substances.

Progress

Observations

Conclusion

Pour water with river sand into a funnel with a filter

________________________

General conclusion: __________________________________________________________________

____________________________________________________________________________________________________________________________________

Workbook on understanding the world

F.I. student(s)________________________________________________

Subject: Water is a solvent. Substances soluble and insoluble in water.

I STAGE: Updating knowledge

Question: Why did the burden of the first donkey become lighter after bathing, and the burden of the second - heavier?

Answer:__________________________________________________________

Question: How can you prove your conclusion?

Answer:___________________________________________________________

Question: What will be the subject of the research?

Answer: ___________________________________________________________

Question: What two groups are substances divided into?

Answer: _ __________________________________________________________

II Stage. Algorithm for learning new things.

Name these substances. Which of them are soluble in water?

_____________ _____________ _______________ ______________

Practical work

Appendix 3 (form 1).

Goal of the work: check the ability of water to dissolve different substances.

Progress

Observations

Conclusion

Pour salt into a glass of water. Stir with a wooden stick.

________________________

General conclusion: __________________________________________________________________

__________________________________________________________________

Appendix 3 (form 2)

Goal of the work: find a way to purify water from insoluble substances.

Progress

Observations

Conclusion

Pour the salt water into a funnel with a filter

________________________

General conclusion: __________________________________________________________________

____________________________________________________________________________________________________________________________________.

III Stage. Multi-level tasks

Level 1

1.Guess the riddles

1.Lives in seas and rivers,
But it often flies across the sky.
How will she get bored of flying?
_____________________________________ falls to the ground again

2. Flowing, flowing -
It won't leak
Runs, runs-
He won't run out. _____________________________________________

3. The autumn rain walked through the city,
The rain lost its mirror.
The mirror lies on the asphalt,
The wind will blow and it will tremble.__________________________________________

2. Level

1. What substance does not dissolve in water?

a) salt

b) juice

c) clay

d) sugar

Why does tea become sweet if you add sugar to it?

n) water is transparent

o) water is a solvent

p) water has no odor

How to purify polluted water?

d) heat

e) cool

d) filter

h) freeze

4.What is the source of water pollution

f) animals

j) plants

a) plants and factories

l) streams

Level 3

Solve the puzzles:

________________________ _________________________

_______________________________

Reflection: create a memo on water protection.

You will learn in this article which substances are soluble in water and which are not.

What substances dissolve in water?

For many substances, water is a good solvent.

Soluble substances: table salt, sugar, soda, cherry juice, starch. They become invisible in water and pass through the filter with it. It is not possible to purify water from such substances using a filter.

Some substances: river sand and clay do not dissolve in water. Using a filter such water
can be cleaned.

Solids (sugar, table salt), liquids (alcohol) and gaseous substances (ammonia, hydrogen chloride) can dissolve in water. Based on their ability to dissolve in water, substances are divided into

1)highly soluble(caustic soda, sugar). Most alkali metal salts are highly soluble in water (with the exception of some tench salts). Chlorides, bromides, and nitrates of alkaline earth metals are also highly soluble in water.

2) sparingly soluble(gypsum, bertholet's salt). Substances that are slightly soluble in water are, for example, gypsum, sulfates, diethyl ether, benzene (liquid substances), methane, nitrogen, oxygen (gaseous substances).

3)practically insoluble(copper sulfide). Glass, silver, gold are practically insoluble substances (solids) in water. These also include kerosene, vegetable oil (liquid substances), inert gases (gaseous substances).

The concept of solubility is used in chemistry to describe the properties of a solid that mixes with and dissolves in a liquid. Only ionic (charged) compounds are completely soluble. For practical needs, it is enough to remember a few rules or be able to find them in order to use them on occasion and find out whether certain ionic substances will dissolve or not in water. In fact, some number of atoms are dissolved in any case, even if the changes are not noticeable, so to carry out accurate experiments it is sometimes necessary to calculate this number.

Steps

Using simple rules

Learn more about ionic compounds. In the normal state, each atom has a certain number of electrons, but sometimes it can capture an additional electron or lose one. As a result, and he, which has an electric charge. If an ion with a negative charge (an extra electron) encounters an ion with a positive charge (no electron), they bond together, like the opposite poles of two magnets. As a result, an ionic compound is formed.
- Ions with a negative charge are called anions, and ions with a positive charge - cations.
- In the normal state, the number of electrons in an atom is equal to the number of protons, making the atom electrically neutral.
Learn more about solubility. Water molecules (H 2 O) have a peculiar structure, which makes them similar to a magnet: they have a positive charge at one end and a negative charge at the other. When an ionic compound is placed in water, these water “magnets” gather around its molecules and tend to pull the positive and negative ions away from each other. The molecules of some ionic compounds are not very strong, and such substances soluble in water, because water molecules pull ions away from each other and dissolve them. In other compounds, the ions are bound more tightly, and they insoluble, since water molecules are not able to pull the ions apart.
- In the molecules of some compounds, internal bonds are comparable in strength to the action of water molecules. Such connections are called slightly soluble, since a significant part of their molecules dissociates, although others remain undissolved.
Learn the rules of solubility. Since the interaction between atoms is described by rather complex laws, it is not always possible to immediately say which substances dissolve and which do not. Find one of the compound ions in the description below of how different substances typically behave. Then look at the second ion and see if it is an exception due to unusual ion interactions.
- Let's say you are dealing with strontium chloride (SrCl 2). Find the Sr and Cl ions in the steps below (they are in bold). Cl "usually soluble"; after that, look into the exceptions below. Sr ions are not mentioned there, so the SrCl compound must be soluble in water.
- Below the relevant rules are the most common exceptions. There are other exceptions, but you are unlikely to encounter them in chemistry class or in the laboratory.
Compounds are soluble if they contain alkali metal ions, that is, Li +, Na +, K +, Rb + and Cs +. These are the elements of group IA of the periodic table: lithium, sodium, potassium, rubidium and cesium. Almost all simple compounds of these elements are soluble.
- Exception: the Li 3 PO 4 compound is insoluble.
The ion compounds NO 3 -, C 2 H 3 O 2 -, NO 2 -, ClO 3 - and ClO 4 - are soluble. They are called nitrate, acetate, nitrite, chlorate and perchlorate ions, respectively. The acetate ion is often abbreviated OAc.
- Exceptions: Ag(OAc) (silver acetate) and Hg(OAc) 2 (mercuric acetate) are insoluble.
- AgNO 2 - and KClO 4 - are only “slightly soluble”.
Compounds of Cl - , Br - and I - ions are usually soluble. Chlorine, bromine and iodine ions form chlorides, borides and iodides, respectively, which are called halogen salts. These salts are almost always soluble.
- Exception: if the second ion in the pair is a silver ion Ag +, mercury Hg 2 2+ or lead Pb 2+, the salt is insoluble. The same is true for the less common halogens with copper ions Cu + and thallium Tl +.
Compounds of the SO 4 2- ion (sulfates) are usually soluble. Generally, sulfates are soluble in water, but there are a few exceptions.
- Exceptions: sulfates of the following ions are insoluble: strontium Sr 2+, barium Ba 2+, lead Pb 2+, silver Ag +, calcium Ca 2+, radium Ra 2+ and divalent silver Hg 2 2+. Note that silver sulfate and calcium sulfate do dissolve slightly in water and are sometimes considered slightly soluble substances.
The compounds OH - and S 2- are insoluble in water. These are hydroxide and sulfide ions, respectively.
- Exceptions: remember the alkali metals (group IA) and the fact that almost all their compounds are soluble? So, Li +, Na +, K +, Rb + and Cs + ions form soluble hydroxides and sulfides. In addition, calcium salts Ca 2+, strontium Sr 2+ and barium salts Ba 2+ (group IIA) are soluble. Please note that a significant portion of the hydroxide molecules of these elements still do not dissolve, so they are sometimes considered “slightly soluble.”
The compounds of CO 3 2- and PO 4 3- ions are insoluble. These ions form carbonates and phosphates, which are usually insoluble in water.
- Exceptions: these ions form soluble compounds with alkali metal ions: Li +, Na +, K +, Rb + and Cs +, as well as with ammonium NH 4 +.
Using the solubility product K sp
1. Find the solubility product K sp (this is a constant). Each compound has its own constant Ksp. Its values for various substances are given in reference books and on the website (in English). The values for the solubility product are determined experimentally and they can differ significantly from one another in different sources, so it is better to use the table for K sp in your chemistry textbook, if such a table is available. Unless otherwise noted, most tables give the solubility product at 25ºC.
  - For example, if you dissolve lead iodide PbI 2, find the solubility product for it. The website bilbo.chm.uri.edu gives a value of 7.1×10 –9.
2. Write down the chemical equation. First, determine which ions the substance molecule will disintegrate into when dissolved. Then write an equation with K sp on one side and the corresponding ions on the other.
  - In our example, the PbI 2 molecule is split into a Pb 2+ ion and two I - ions. In this case, it is enough to establish the charge of only one ion, since the overall solution will be neutral.
  - Write down the equation: 7.1×10 –9 = 2.
3. Rearrange the equation to solve it. Rewrite the equation in simple algebraic form. Use what you know about the number of molecules and ions. Substitute the unknown quantity x for the number of atoms of the soluble compound and express the number of ions in terms of x.
  - In our example, it is necessary to rewrite the following equation: 7.1 × 10 –9 = 2.
  - Since the compound contains only one lead (Pb) atom, the number of dissolved molecules will be equal to the number of free lead ions. Thus, we can equate and x.
  - Since there are two iodine (I) ions for every lead ion, the number of iodine atoms should be equal to 2x.
  - The resulting equation is 7.1×10 –9 = (x)(2x) 2 .
4. Consider common ions if necessary. Skip this step if the substance is soluble in pure water. However, if you use a solution that already contains one or more of the ions of interest ("total ions"), the solubility may be significantly reduced. The effect of common ions is especially noticeable for poorly soluble substances, and in such cases it can be assumed that the vast majority of dissolved ions were already present in the solution previously. Rewrite the equation to include the known molar concentrations (moles per liter, or M) of the ions already dissolved. Adjust the unknown x values for these ions.
  - For example, if lead iodide is already present in a solution at a concentration of 0.2M, the equation should be rewritten as follows: 7.1×10 –9 = (0.2M+x)(2x) 2 . Since 0.2M is much larger than x, we can write the equation as 7.1×10 –9 = (0.2M)(2x) 2 .

Water is a solvent

a liquid substance in which other substances are dissolved a substance that has dissolved in a solvent Solute Solvent Excellent solvent

We want to find out. Many substances in water can disintegrate into invisible tiny particles, that is, dissolve. Therefore, water is a good solvent for many substances. I propose to conduct experiments and identify methods by which it will be possible to obtain an answer to the question of whether a substance dissolves in water or not. What are we taking? What are we seeing? Salt? Granulated sugar? River sand? Clay? What does solubility depend on (experiment)?

Solubility is the content of solute in a saturated solution. There are:

Let's conduct an experiment: Fill a transparent glass with boiled water. Pour a teaspoon of table salt into it. While stirring the water, observe what happens to the salt crystals.

The salt dissolved in the water. Transparency has not changed. The color has not changed. But the taste - yes! The solution became salty.

Insert a funnel with a filter into an empty glass and pass water and salt through it. The salt and water passed through the filter; it did not remain on the filter. And the taste after filtering is the same. So she dissolved.

Let's conduct an experiment: Fill a transparent glass with boiled water. Pour a teaspoon of granulated sugar into it. While stirring the water, observe what happens to the sugar crystals.

Sugar dissolved in water. The transparency of the water has not changed. The color has not changed. Sugar was no longer visible in the water. But the taste – yes!

Insert a funnel with a filter into an empty glass and pass water and sugar through it. Sugar dissolved in water. It did not remain on the filter, it passed along with the water. And the taste after filtering is the same.

Let's carry out the experiment: Stir a teaspoon of river sand in a glass of water. Let the mixture sit.

The color of the water changed, it became cloudy and dirty. Large grains of sand lie on the bottom, small ones float. The sand did not dissolve.

Insert a funnel with a filter into an empty glass and pass the contents through it. The sand remained on the filter, the water passed through and was purified. The filter helps purify water from particles that do not dissolve in it.

Let's carry out the experiment: Stir a teaspoon of clay in a glass of water. Let the mixture sit.

The clay has not dissolved in the water, the water is cloudy, large clay particles have fallen to the bottom, and small ones float in the water.

Pass the contents of the glass through a paper filter. Water passes through the filter, and undissolved particles remain on the filter. The filter helped clean the water from particles that did not dissolve in the water.

Water is a liquid substance that has no taste, color or smell. Pure water is absolutely transparent. If you pour water into a glass glass, you can see objects behind it through its walls. Water has fluidity, thanks to which it penetrates through cracks and crevices and permeates everything around.

In liquid state, water:

fills seas, oceans, rivers and lakes;
saturates the soil;
part of plants;
is part of the bodies of mammals.

The amazing property of water is that it knows how to dissolve almost everything around. There are some objects that get wet but remain undissolved. How and why does this happen?

What is a solution?

When a substance dissolves, it mixes with a liquid to form a solution. A solution can be called tea in a glass, where the sugar cube was placed before. Water that has absorbed sugar tastes sweet. When a substance combines with a solvent, a solution is formed. An aqueous solution is a water-soluble substance that has been diluted with pure water. Water is a good solvent, but it cannot dissolve stone, wood, or plastic. If you throw several pebbles into water, they will remain at the bottom of the glass.

How does this happen?

If we examine a drop of water under a microscope, we will see that it consists of special particles called molecules. They cannot be seen with the naked eye. Water molecules are electrically neutral, this means that they are “friendly” with all substances. They have a special attraction to certain substances. The amazing friendliness of water molecules allows them easily combine with molecules of other substances, carrying a charge.

When it comes into contact with the molecules of another substance, the attraction intensifies, as a result the substance mixes with water, completely dissolving in it. If there is no attraction, then, accordingly, everything remains unchanged. The substance will remain at the bottom of the glass. If you add a little salt to the water and stir it with a spoon, the salt will soon disappear. The water will taste salty.

What is clean water?

Absolutely pure water does not exist in nature. Almost all liquids that we see in everyday life are solutions. Tap water is a solution of water with iron impurities. Before entering the glass, water flows through iron pipes, absorbing iron molecules. Natural solutions are drinks - tea, juice and compotes. All of them contain components beneficial to the human body. Water can dissolve not only solids, but also liquid and gaseous substances.

There is always something dissolved in ordinary water. Rain, water, river or lake water contains any impurities.

Which substances dissolve in water and which do not?

In nature there are solid, liquid and gaseous substances endowed with various properties. Some of them are able to dissolve in water, others are not. Depending on this feature, the following groups of substances are distinguished:

water-repellent (hydrophobic);
attracting water (hydrophilic).

Hydrophobic substances are either poorly soluble in water or do not dissolve in it at all. Such substances include rubber, fat, glass, sand, etc. Some salts, alkalis and acids can be called hydrophilic substances.

Since the cells of the human body contain a membrane containing fatty components, the fat does not allow the human body to dissolve in water. Due to the unique structure of a living organism, water not only does not absorb body cells, but supports human life.

Let's sum it up

When water comes into contact with food, it dissolves nutrients and then releases them to the cells of the human body. In return, the water picks up waste products, which are released through sweat and urine.

There are few substances in nature that are not soluble in water. Even metal, upon prolonged contact with water, begins to dissolve in it.

Water with components dissolved in it acquires new qualities. For example, a silver solution can kill microbes. Water is a system that can be beneficial or harmful to humans. And this depends on what is dissolved in it.

If this message was useful to you, I would be glad to see you

What dissolves in water? Highly dispersed systems (true solutions) All substances are soluble in water.

What substances dissolve in water?

Steps

Using simple rules

Using the solubility product K sp

What is a solution?

How does this happen?

What is clean water?

Which substances dissolve in water and which do not?

Let's sum it up