Question

какие из приведенных солей Na2C03, ZnSo4, AlCl3, подвергаются гидролизу по аниону? Приведите реакции этих солей в ионном и в молекулярном виде Какой показатель рН (> или< 7) имеют растворы этих солей?

Answer 1

Ответ:Na2SO3

Объяснение:

Answer 2

Hydrolysis of Salts and pH of their Solutions

When certain salts dissolve in water, they can undergo hydrolysis, a chemical reaction with water that results in the formation of acidic or basic species. In the case of the salts Na2CO3, ZnSO4, and AlCl3, let's examine their hydrolysis reactions and the pH of their solutions.

1. Sodium Carbonate (Na2CO3): - The hydrolysis of sodium carbonate occurs due to the presence of the carbonate ion (CO3^2-) in the salt. - The carbonate ion reacts with water to form bicarbonate ion (HCO3-) and hydroxide ion (OH-): ``` CO3^2- + H2O ⇌ HCO3^- + OH^- ``` - The hydroxide ion (OH-) makes the solution basic, resulting in a pH greater than 7.

2. Zinc Sulfate (ZnSO4): - Zinc sulfate does not undergo hydrolysis because neither the zinc ion (Zn^2+) nor the sulfate ion (SO4^2-) reacts with water to form acidic or basic species. - Therefore, the pH of a solution of zinc sulfate will depend on the concentration of the salt and any other acidic or basic substances present.

3. Aluminum Chloride (AlCl3): - Aluminum chloride undergoes hydrolysis due to the presence of the chloride ion (Cl-) in the salt. - The chloride ion reacts with water to form hydrochloric acid (HCl) and hydroxide ion (OH-): ``` Cl^- + H2O ⇌ HCl + OH^- ``` - The presence of hydrochloric acid (HCl) makes the solution acidic, resulting in a pH less than 7.

To summarize: - The salt Na2CO3 undergoes hydrolysis, resulting in a basic solution with a pH greater than 7. - The salt ZnSO4 does not undergo hydrolysis, so the pH of its solution will depend on other factors. - The salt AlCl3 undergoes hydrolysis, resulting in an acidic solution with a pH less than 7.

Please note that the pH values mentioned here are general indications and can vary depending on the concentration of the salt and other factors present in the solution.

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