On dissolving ammonium carbonate in water, we get 4 3 2 4 2 3 2 NH CO H O NH OH H CO Both 2 3 H CO & 4 NH OH are a weak acid and weak base respectively. Now, the value of 7 a K 4.4 10 x for 2 3 H CO and 5 b K 1.79 10 x . Higher the value of a b K &K stronger is the acid and base respectively. Between the above two weak acid and base, the b K value is higher than a K . This means that the base is stronger than the acid and thus, and a stronger base will dissociate more increasing hydroxyl ion concentration which makes the solution basic. Hence, the aqueous
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