Question
Show that degree of hydrolysis of a salt of weak acid and weak base is independent of concentration of the solution.
Or
Derive the relation, 
in case of hydrolysis of a salt of weak acid and weak base.
Solution
Let us consider the example of ammonium acetate.
Let c be the initial concentration of ammonium acetate in moles per litres and a be the degree of hydrolysis. The equilibrium concentration of various species are:
Initial conc. c c 0 0
Equilibrium
conc.
Since
is very small as compared to unity,
Hence degree of hydrolysis (R) is independent of the concentration of the solution.
Let c be the initial concentration of ammonium acetate in moles per litres and a be the degree of hydrolysis. The equilibrium concentration of various species are:
Initial conc. c c 0 0
Equilibrium
conc.
Since
is very small as compared to unity,Hence degree of hydrolysis (R) is independent of the concentration of the solution.
