Can salts be hydrolyzed? What are the substances that are dihydrolyzed? What do you think about the

Not all salts are hydrolyzable.

Hydrolysis is generally the ionization of salt in water, and the generated ions combine with hydrogen ions or hydroxide ions in the water to produce relatively stable substances. To inhibit it is to add some substances that are more strongly binding to ions and water than ionized to change the equilibrium constant.

Generally, weak acids and weak alkali salts are double hydrolyzed.

Promotion and inhibition of dihydrolysis? It can promote the ionization of water and provide more reactants for hydrolysis. If the equilibrium constant of water decreases, or if it affects the binding force between ions and water, it can be hydrolyzed all the time.

Hydrolysis occurs further after ionization.

I haven't read a book for a long time, and it seems that I will talk about this in detail in inorganic chemistry at university.

First of all, understand what is a strong acid (alkali) and what is a weak acid (alkali).

Everything that cannot be completely ionized in solution, such as acetic acid, such as ammonia, is a weak electrolyte. They all have acetic acid molecules or ammonia monohydrate molecules in their solutions, so they are all weak acids (bases).

The opposite is a strong acid (base). Such as sulfuric acid, nitric acid, sodium hydroxide, etc. Taking sulfuric acid as an example, there are no sulfuric acid molecules in the solution, only hydrogen ions and sulfate ions, such an electrolyte is a strong electrolyte, and such an acid (base) is a strong acid (base).

The salt formed by the combination of strong acid and strong base is a strong acid and strong alkali salt, which cannot be hydrolyzed in solution, but can only be ionized (in other words, ionization is much greater than hydrolysis).

Salts formed by strong acids and weak bases, or salts formed by strong bases and weak acids, will be hydrolyzed by the weaker ones, such as acetate in sodium acetate. Such salt will be hydrolyzed. There are both sodium ions, acetate ions, and acetic acid molecules in sodium acetate solution.

According to the principle of who is strong and who is strong, sodium hydroxide is a strong base, and acetic acid is a weak acid, so the solution is alkaline).

The weak acid and weak alkali salt, such as ammonia acetate, are hydrolyzed together on both sides, and the degree of hydrolysis is much greater than that of strong acid and weak alkali salt. Because the ammonia ion needs hydroxide ionized by water, and the acetate ion needs hydrogen ions ionized by water, each side takes what it needs and promotes each other, which is called double hydrolysis.

Under normal circumstances, the hydrolysis of salt is inhibited by the mixing of strong acid and weak alkali salt solution with strong acid and weak alkali salt solution or the mixing of strong alkali and weak salt with strong alkali and weak salt, because the hydrolysis solutions of two strong acids and weak alkali salts are acidic, and the hydrolyzed solutions of two strong alkalis and weak salts are alkaline.

For example, aluminum sulfate solution and ammonium sulfate solution are mixed, because the hydrolysis of the two salt solutions is acidic, so they inhibit each other's hydrolysis; In general, the mixture of strong acid and weak alkali salt solution with strong alkali and weak salt solution or strong acid and weak alkali salt and strong alkali and weak salt will promote the hydrolysis of salt with each other. Because one salt hydrolysis is acidic and the other salt hydrolysis is alkaline, the two salts promote the hydrolysis of each other.

For example: sodium bicarbonate and aluminum sulfate, sodium bicarbonate hydrolysis is alkaline, aluminum sulfate hydrolysis is acidic, so they promote hydrolysis with each other.

For the first question, we should remember that the promotion of hydrolysis is divided into complete double hydrolysis and incomplete refreshing hydrolysis, and complete double hydrolysis has Al3+ and HCO3-, CO32-, HS-, S2-, Clo-, AlO2-, SiO32-;

Fe3+ with HCO3, CO32, CLO-, ALO2-;

Fe2+ vs. AlO2-;

Mg2+ vs. AlO2-;

NH4+ with SIO32-, ALO2-

And incomplete double hydrolysis has acetate and ammonium, although the hydrolysis of the two promote each other, but ammonium acetate is stable in solution, called incomplete double hydrolysis, similar to magnesium ions and bicarbonate ions, ammonium ions and sulfur ions, by the way, Tianjin college entrance examination also tested a magnesium ion and silicate ion double hydrolysis, remember this, mutual inhibition of hydrolysis is of course not equal to double hydrolysis. For example, ammonium ferrous sulfate, that is, molar salt, you should have done this substance, some questions will let you compare its acidity with ammonium sulfate, it must be the acidity of ammonium ferrous sulfate, because the two hydrolysis are acidic, inhibiting each other, so that the hydrolysis balance shifts to the left.

For the hydrolysis of alkaline salts, the hydrolysis equation is a-+H2O=HA+OH-, if the addition of new salts causes OH-, HA to increase or decrease A- then the hydrolysis will be inhibited, and if the addition of new salts makes OH- increase or consume OH-, HA is to promote hydrolysis.

The same is true if the hydrolysis is alkaline.

The organic part of the hydrolysis reaction is the reaction of water with another compound, the compound is decomposed into two parts, the hydrogen atom in the water is added to one part, and the hydroxyl group is added to the other part, so that the reaction process of two or more new compounds is obtained, and the inorganic part is the weak acid group or weak base ion that reacts with water to form weak acid and hydroxide ion (or weak base and hydrogen ion). The most industrially used is the hydrolysis of organic matter, mainly to produce alcohols and phenols. The hydrolysis reaction is the reverse reaction of the neutralization or esterification reaction.

The hydrolysis of most organic compounds is difficult to carry out smoothly with water alone.

The process in which the ions of salt in solution are ionized with the H+ or OH- ionized by water to form a weak electrolyte is called the hydrolysis of salts.

Hydrolysis conditions of salts: Salt must be soluble in water, and salt must be able to ionize weak acid ions or weak base cations.

Substance: In solution, because the ions ionized by the salt combine with the ions ionized by the water to form a weak electrolyte, the ionization balance of the water is destroyed, and the ionization balance of the water moves in the direction of ionization, showing different concentrations of acidic, alkaline or neutral. [1]

Rules: insoluble and not hydrolyzed, only when there is weakness, and no weak is not hydrolyzed; Whoever is weak is hydrolyzed, the weaker the more hydrolyzed, and all weak are hydrolyzed; Who is strong and who is sexual, the same strong is neutral, and the weak is specific; The hotter it is, the more hydrolyzed, and the thinner it is, the more hydrolyzed.

Features: The hydrolysis reaction and the neutralization reaction are in dynamic equilibrium, and the hydrolysis is carried out to a very small extent.

The hydrolysis reaction is endothermic.

Salts are dissolved in water, mainly ionized, supplemented by hydrolysis.

Hydrolysis of multiple weak acid ions is carried out step by step, with the first step as the main step.