Question

(a) Solution P has a pH of 13, solution Q has a pH of 6 and solution R has a pH of 2.
(i) Which solution will liberate ammonia from ammonium sulphate on heating?
(ii) Which solution is a strong acid?
(iii) Which solution contains solute molecules as well as ions?

Answer 1

(i) Ammonia will be liberated from ammonium salts like ammonium sulphate by the addition of an alkaline solution. Therefore, solution P must be used.
(ii) Solution R with a pH of 2 is a strong acid.
(iii) A solution containing solute molecules and ions is nearly neutral with pH 7. Solution Q, with a pH of 6, is closest to this.