Question

Aqueous solution of sodium carbonate is alkaline whereas aqueous solution of ammonium chloride is acidic. Explain.

Answer 1

(A) 

(i) Sodium carbonate is a salt of weak acid and strong base. 

(ii) In aqueous solution it undergoes hydrolysis.

(iii) Strong base dissociates completely while weak acid dissociates partially since [OH^-] > [H₃O⁺], the solution is basic.

(B) 

(i) Ammonium chloride is a salt of strong acid and weak base. 

(ii) In aqueous solution it undergoes hydrolysis

(iii) Since [H⁺] or [H₃O⁺] > [OH^-] the solution is acidic.