Explain common in effect.

Discuss the salt hydrolysis in the following cases:
(i) Salts of strong acid and strong base
(ii) Salts of strong acid and weak base
(iii) Salts of weak acid and strong base
(iv) Salts of weak acid and weak base.

Explain the following terms:
(i) Hydrolysis constant
(ii) Degree of hydrolysis.

Derive the relation, in the case of hydrolysis of salts of strong acids and weak acids.

Show that for an aqueous solution of a salt of weak base and strong acid  where  is the degree of hydrolysis. 

Derive an expression for the degree of hydrolysis of NH₄Cl.

Derive the relations:

for a solution of a salt of weak acid and strong base.