Question

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

Answer 1

The solution is as follows:

1. The solution of P when heated with ammonium sulphate liberates ammonia. The reaction is as follows:

(NH₄)₂SO₄(aq) + BOH (aq) $\underset{∆}{\to }$ 2 NH₃(g) + BSO₄(aq) + H₂O

2. As solution R has pH 2, it is the strongest acid.

3. Solution Q is slightly acidic, thus it has only molecules and ions.