Question

Why 

(i) an aqueous solution of NH Cl is acidic. 

(ii) while that of HCOOK basic ?

Answer 1

(i) 

(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.

(ii) HCOOK is a salt of weak acid HCOOH and strong base KOH. In aqueous solution it undergoes hydrolysis giving weak acid and strong base KOH which dissociates completely,

\(\therefore\) [OH^-] > [H₃O⁺], and the solution reacts basic.