CBSE Class 11-science Answered
Salt hydrolysis: It is defined as a reaction in which cation or anion or both of a salt react with water to produce acidity or alkalinity.
The reaction of an anion or cation with water accompanied by cleavage of O-H bond is called hydrolysis.
A- + H O H HA + OH-
Anionic hydrolysis
B+ + H O H BOH + H+
Cationic hydrolysis
In anionic hydrolysis, the solution becomes slightly basic (p H >7).
In cationic hydrolysis, the solution becomes slightly acidic (p H <7).
Salts of weak acids and strong bases undergo anionic hydrolysis and yield basic solution.
Salts of weak bases and strong acids undergo cationic hydrolysis and yield slightly acidic solution.