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1. Predict whether an aqueous solution of (NH4)2 SO4 is acidic, basic or neutral? 2. Justify your answer.

Answer»

1. An aqueous solution of (NH4) SC4 is acidic in nature. 

2. (NH4)2SO4 is formed from weak base, NH4OH, and strong acid, H2SO4 .

In water, it dissociates completely

(NH4)2 SO4 (aq) → 2NH+4 (aq) + SO2-4 (aq)

NH+4 ions undergoes hydrolysis to form NH4OH and H+ ions.

NH4 +(aq) + H2O(l) ⇌ NH4OH(aq) + H+(aq)

NH4OH is a weak base and therefore remains almost unionised in solution. This results in increased H+ ion concentration in solution making the solution acidic.



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