Factors influencing the solubility of insoluble salts help me do chemistry questions .

Homoionic effect. BaSO4 = Ba+ +SO42- when the dissolution of insoluble salts reaches equilibrium in solution. The addition of congiocrystalline ions (barium or sulfate) to the solution will cause the equilibrium to shift to the left and the salt solubility to decrease.

Salt effect. In the dissolution equilibrium system of poorly soluble compounds, an appropriate amount of strong electrolyte is added. Does not react with insoluble substances. There are no common ions. It can increase the solubility of insoluble substances. And the more charge the strong electrolyte is added, the greater the impact.

So it's BCAD

The ionization equation of barium sulfate in water: BaSO4==BA+SO4 So an increase in the concentration of sulfate ions will shift the equilibrium to the left and the solubility will decrease. B Sodium chloride solution Cl can trap a small amount of Ba, so that the first equation moves to the right, the solubility increases slightly, in Cd because the copper ion can form the same intolerant copper sulfate with the sulfate, it is the sulfate ion that decreases, the first equation moves to the right, and the solubility increases the most.

b, solubility decreases due to the ionic effect.

a, No other influencing factors.

c. Due to the ionic strength, the "activity" decreases and the solubility increases.

d, strong ionic strength, "activity" decreases a lot, and solubility increases.

The greater the ionic strength of the solution, the higher the solubility of the weak electrolyte.

So d>a> water.

However, the Na2SO4 solution in B contains a large number of sulfate particles.

It will inhibit the ionization of barium sulfate, so it is less soluble than pure water.

So B "Water

Salt effect pairsSolubilityImpact:

to weak electrolytes.

A strong electrolyte that does not have the same ions as the weak electrolyte is added to the solution.

, due to the increase of the total ion concentration in the solution, the mutual traction between ions is enhanced, so that the weak electrolyte dissociates the anions and cations.

The chance of binding to form molecules decreases.

As a result, the concentration of weak electrolyte molecules decreases, the ion concentration increases correspondingly, and the degree of dissociation increases, which is called the salt effect. When the solubility decreases, it is saltingout; Otherwise, it is saltingin.

Salt effect: increases the solubility of insoluble substances:

For example, the solubility of PBSO4 in KNO3 solution is greater than that in pure water. This is because the addition of a strong electrolyte PBSO4 that does not contain the same ions reduces the number of collisions on the precipitated surface, which slows down the precipitation process and shifts the equilibrium in the direction of precipitation dissolution, so the solubility of insoluble substances increases.

When an electrolyte containing the same ions is added, there is a salt effect as well as a homoionic effect.

The effect of the latter is greater than that of the former, so only a decrease in the solubility of insoluble substances can be observed.

The ionization degree of weak electrolyte is increased.

In the weak electrolyte solution, the addition of a strong electrolyte that does not contain the same ions will increase the ionization degree of the weak electrolyte due to the salt effect. For example, the degree of ionization of acetic acid solution is that if it is present in the solution, the ionization degree of acetic acid increases to.

If a strong electrolyte containing the same ions is added to the weak electrolyte solution, the salt effect and the homoion effect occur at the same time, but the salt effect has much less effect on the ionization equilibrium than the ion effect.

For example, sodium acetate is added to the acetic acid solution.

Due to the homoionic effect, the degree of ionization decreases from orders of magnitude to.

The salt effect does not change the degree of ionization by an order of magnitude, so the salt effect can be ignored when the two effects coexist.

The greater the ionic strength of the solution, the higher the solubility of the weak electrolyte.

So d>a> water.

However, the Na2SO4 solution in b contains a large number of sulfate particles, which will inhibit the ionization of barium sulfate, so it is less solubility than that in pure water, so b《water.

The specific influencing factors are as follows:

1.Homoionic effect.

2.Salt effect.

3.Acid effect.

4.Coordination effect.

5.Other factors such as temperature, solvent influence, and precipitation.

weight particle size and structure effects.

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

Correct answer: The only factors that affect the solubility of insoluble salts are: homoionic effect, salt effect, acid effect, complexation effect, etc. Among them, the salt effect is the effect of ionic strength on the degree of dissolution cracking.

The details are as follows:

1. The higher the salinity, the greater the evaporation, and the higher the temperature, so the more substances are dissolved.

2. The higher the salinity, the greater the content of the solubilizing enzyme of the salt itself, and the dissolving effect will become stronger.

Too much, too much.

Let's give you ten examples.

Salts that are easily soluble in water: sodium chloride, potassium chloride, sodium carbonate, sodium thiocatinoate, copper sulfate, potassium nitrate, sodium sulfide, potassium iodide, silver nitrate, ammonium nitrate.

Insoluble salts in water: calcium carbonate, calcium phosphate, calcium fluoride, barium sulfate, barium carbonate, silver chloride, silver sulfide, mercury sulfide, ferrous sulfide, iodine silver tung ride.

Categories: Education, Science, >> Learning Aid.

Problem description: Salt hydrolysis, external causes: why salt hydrolysis weak ion concentration is smaller and easier to hydrolyze.

Analysis: The hydrolysis of salts is a chemical equilibrium, according to the principle of equilibrium movement (Lechatre's principle), the thinner the solution, that is, the more water there is, the equilibrium will move in the direction of hydrolysis. Therefore, the smaller the concentration of salt hydrolysis, the easier it is to hydrolyze.

For example, nitrate cress imitation cave silver solution is the following balance:

agno(3)+h(2)o agoh+hno(3)The more water there is, the more water shifts the equilibrium to the right, that is, the smaller the concentration of salt hydrolysis, the more it is easy to hydrolyze.