Question
Derive the relations:
for a solution of a salt of weak acid and strong base.
Solution
Consider the hydrolysis of a simple salt of a weak acid with a strong base i.e. BA. The hydrolysis of BA may be represented as:
The hydrolysis constant Kh is given by
For the weak acid HA, the dissociation equilibrium is
i.e. Hydrolysis constant is inversely proportional to the dissociation constant Ka of the weak acid. Weaker the acid, the greater is the hydrolysis constant of the salt.
The hydrolysis constant Kh is given by
For the weak acid HA, the dissociation equilibrium is
i.e. Hydrolysis constant is inversely proportional to the dissociation constant Ka of the weak acid. Weaker the acid, the greater is the hydrolysis constant of the salt.
