pBlock ElementsII 1 Question 95
91. Give reasons in one or two sentences.
Ammonium chloride is acidic in liquid ammonia solvent.
(1991, 1M)
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Solution:
- Ammonia, in liquid state undergo self-ionisation as :
$$ 2 \mathrm{NH}{3} \rightleftharpoons \mathrm{NH}{4}^{+}+\mathrm{NH}_{2}^{-} $$
Thus, addition of $\mathrm{NH}{4} \mathrm{Cl}$ to liquid ammonia increases concentration of $\mathrm{NH}{4}^{+}$in solution and $\mathrm{NH}_{4} \mathrm{Cl}$ act as acid.
