Why can saturated solutions dissolve other solutes?

Not necessarily. Let's assume that the subject is discussing a simple case of dissolution of ionic compounds in an aqueous solution system.

For a salt, taking sodium chloride as an example, in the saturated solution, the aqueous solution is still filled with water molecules, and there are a large number of free sodium hydrate ions and chloride hydrate ions in it. Chloride hydration and sodium hydrate are constantly colliding in them, some of which are capable of producing ionic bonds to form clusters, but at the same time there are water molecules colliding and causing the clusters to disperse. In saturated solution, ionic bonds are formed at an equal rate and are broken, so there is no precipitation.

At this time, if new sodium ions or chloride ions are added, the probability of collision between sodium ions and chloride ions will increase, and the corresponding rate of ionic bond formation will be greater than the rate of ionic bond breakage. At this time, it may not be possible to precipitate, but once several chloride ions and sodium ions combine to form a large cluster somewhere in the solution, and the obtained lattice energy crosses the potential barrier of nucleation (mainly the interface energy of water and sodium chloride crystals), more chloride ions and sodium ions will be added to the nucleation process, because the energy cost of crystal growth is smaller than that of generating new crystal nuclei, and precipitation is generated. This process continues until the rate at which the ions bind to the crystal surface is equal to the rate at which the ions on the crystal surface are knocked down by water molecules (the solution returns to saturation again).

Therefore, if hydrochloric acid is added to the saturated sodium chloride solution, the sodium chloride can be seen to precipitate. Of course, if silver nitrate is added, the rate at which the hydrated silver ions collide with the hydrated chloride ions and form bonds is much greater than the rate at which the water hits the ions on the surface of the silver chloride. <>

<> chemicals are ionic compounds.

In the unsaturated solution there is no longer "sodium chloride."

This substance has only chloride ions hydrated.

and sodium hydration. In a saturated solution, the dissolution equilibrium satisfies, and generally speaking, the dissolution equilibrium equation for a single salt in the form of ANBM is:

c[a] n * c[b] m = some temperature-dependent constant.

Therefore, at this time, it is very general to talk about "other substances", such as hydrochloric acid, then the sodium ions in the solution will be "forced" to precipitate, and some chloride ions will be recrystallized into sodium chloride crystals (mostly amorphous). At first glance, the addition of other substances will not affect the above dissolution equilibrium equation, but the increase in the number of ions will affect the ionic potential of the solution system, and the interaction between various ions is very complex, so it is difficult to say whether other solutes can be dissolved again. <>

At a certain temperature, in a certain amount of solvent, the rock forest solution that can also dissolve a certain substance is called the unsaturated solution of this solute.

Solubility. At a certain temperature, the mass dissolved by a solid substance when it reaches saturation in 100g of solvent is called the solubility of the substance in this solvent.

At a certain temperature, a certain solute is added to a certain amount of solvent, and when the solute can not continue to dissolve, the resulting solution is called the saturated solution of this solute.

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Saturated solutions can dissolve other solutes, for example, at a certain temperature, a saturated solution of sodium chloride can dissolve sucrose. However, when there are two solutes in the water, their solubility is no longer equal to the solubility of their respective solutes, and will increase or decrease slightly. If they are dominated by the homoionic effect, the solubility of the solubility will decrease, and if they are dominated by the salt effect, the solubility will increase.

At a certain temperature, a certain solute is added to a certain amount of solvent, and when the solute can not continue to dissolve, the resulting solution is called the saturated solution of this solute; The solution that can continue to dissolve is called the unsaturated solution of this solute.

In the case of increasing the solvent or increasing the temperature, the saturated solution can become an unsaturated solution. Therefore, only by specifying "in a certain amount of solvent" and "at a certain temperature" can the "saturation" and "non-excitation saturation" of the solution have a definite meaning.

Solubility refers to the amount of solute in a certain amount of saturated solution at a certain temperature and pressure. It is customary to call the quality of the solute dissolved when the saturated state of 100g of solvent is called the solubility of the solute in this solvent. If no solvent is specified, solubility is usually referred to as the solubility of the substance in water.

Summary. No, the solubility of adding water remains the same, but the amount of water that can be dissolved increases, and it is not saturated. After the temperature rises, the solubility increases, the amount of dissolved solid water does not change, and the mass fraction does not change.

The saturated solution becomes an unsaturated solution, which is dissolved with water. If there is more substance, does it mean that the solubility of the substance has increased?

No, adding water means that the solubility remains the same, but the amount of water that can be dissolved increases as it increases, and it is not saturated. After the temperature is raised, the solubility increases, the amount of dissolved solid water does not change, and the mass fraction does not change.

The more substances dissolved after the increase, doesn't it mean that the solubility has increased?

The solubility of a substance is constant at all times except for the influence of temperature.

After adding water, the solute dissolved becomes more solubility is not the solubility of the substance. Doesn't the more dissolved means that the ability has increased, and the solubility has increased.

Water is a solvent, which can only indicate that water has the ability to dissolve other substances.

When some substances are dissolved in another substance, they have the upper limit of the maximum concentration (under certain temperature, pressure, etc.), and this concentration is called "saturated concentration", and the state that reaches the saturation concentration is called "saturated state".

For example, salt (sodium chloride) is soluble in water, and the solubility at room temperature is about 40 grams and 100 grams, which is converted into a mass concentration of about, which is the saturated concentration of salt dissolved in water.

However, some substances are infinitely miscible with each other, and there is no saturation state in such a solution composed of two or more substances.

Water and alcohol, for example, can be miscible in any proportion. Therefore, when alcohol is dissolved in water, there is no concept of "solubility" and "saturation concentration", and there is no "saturated state".

Not all substances are soluble in water, for example, most organic substances are not easily soluble in water. Soluble in water can reach a saturated state and is related to solutes and solvents, and the solubility of solutes will be different due to different solvents.

Of course, it can be dissolved, saturation is only saturated with one solute, and another solute can be added to dissolve into the solvent.

Solubility of a substance in the presence of other substances:

Some solutes are in their dissolved state, such as sucrose, and some are in their dissolved state, such as sodium chloride. The dissolution of every substance is controlled by a solubility constant or dissolution equilibrium. Dissolution equilibrium is the chemical equilibrium of any compound in its solid and dissolved state in its saturated state.

If there are no identical particles between different solutes after dissolving, then their dissolution does not interfere with each other.

For example, when sucrose is added to a saturated sodium chloride solution, the presence of chloride and sodium ions has no effect on the dissolution of sucrose because there is no chloride ion and sodium ion in the dissolution equilibrium of sucrose.

However, it is important to note that the dissolution of any substance requires the participation of water molecules. Therefore, the process of dissolution is actually a process of decreasing the concentration of free water molecules. Although the dissolution of sodium chloride does not affect the dissolution of sucrose, it reduces the concentration of free water in the solution, so that the maximum amount of sucrose dissolved in the sodium chloride solution is less than the amount dissolved in the same volume of water.

A saturated solution of one substance can then dissolve another substance to saturate this substance. For example, potassium permanganate is added to a glass of saturated salt water, and the solution turns red.

At a certain temperature, a certain solute is added to a certain amount of solvent, and when the solute can no longer be dissolved, the resulting solution is called the saturated solution of this solute under this condition. The solute dissolves in the solvent dissolution process, first of all, the diffusion of the solute in the solvent, the molecules or ions on the surface of the solute begin to dissolve, and then diffuse into the solvent. The dissolved molecules or ions are constantly moving in the solution, and when they collide with the solid surface, there is a possibility that they will stay on the surface, and this deposition is the reverse process of dissolution.

When the solid solute continues to dissolve and the concentration of the solution continues to increase to a certain value, the two effects of deposition and dissolution reach a dynamic equilibrium state, that is, when the number of molecules or ions dissolved in the solvent per unit time is equal to the number of molecules or ions deposited on the surface of the solute, although the dissolution and deposition are still continuous, but if the temperature does not change, the concentration of the solution has reached a stable state, such a solution is called a saturated solution, and the amount of solute contained in it is the solubility of the solute at that temperature. It can be seen that in a saturated solution, the rate of dissolution of the solute is equal to the rate at which it accumulates from the solution, in a state of dynamic equilibrium.

At a certain temperature, a solution of a solute can no longer be dissolved in a certain amount of solvent (i.e., a solution that has reached the solubility of that solute). A solution in which a solute can continue to dissolve at the same temperature (i.e., a solution that has not yet reached the solubility of the solute) is called an "unsaturated solution". If the solute is a gas, the pressure of the gas is also indicated.

When two salts (or acids or bases) containing the same ions are dissolved in water, their solubility (or acidity coefficient) decreases, a phenomenon called the homoionic effect. In a solution of a weak electrolyte, if a strong electrolyte containing the same ions as the weak electrolyte is added, the ionization of the weak electrolyte will be reduced. Similarly, the addition of a strong electrolyte containing the same ions as the electrolyte in an electrolyte-saturated solution will also reduce the solubility of the electrolyte.

A saturated solution of one substance can be dissolved again until the substance is saturated, and there can be no same composition between the two substances.

Yes, but only in the presence of different ions.

Analysis: At a certain temperature, a saturated solution of a substance may be a concentrated solution or a dilute solution; It can still dissolve other solutes; The saturated solution of the substance can no longer be dissolved at a certain temperature, in a certain amount of solvent can no longer continue to dissolve the solution of the substance a, at a certain temperature, the saturated solution of a substance may be a concentrated solution, or it may be a dilute solution, because it is related to the solubility of the solute, so it is wrong; b. At a certain temperature, the saturated solution of a substance can still dissolve other solutes, so it is wrong; c. At a certain temperature, the saturated solution of a substance may be a concentrated solution or a dilute solution, because it is related to the solubility of the solute, so it is wrong; d. At a certain temperature, the saturated solution of a substance must be a solution that can no longer dissolve the substance Therefore, it is correct Therefore, d is selected Comments: There is no necessary connection between the concentration of the solution and whether it is a saturated solution, because the concentrated solution may be a saturated solution or an unsaturated solution To fully understand the meaning of saturated solution, only in this way can we make a correct judgment on the problem

Saturated solution: A solution when the solute can no longer be dissolved.