An aqueous solution of ammonium chloride (NH₄Cl) is acidic because the ammonium ion (NH₄⁺) reacts with water, releasing hydrogen ions (H⁺), thus increasing the acidity of the solution.

An aqueous solution of ammonium chloride (NH₄Cl) is acidic because the ammonium ion (NH₄⁺) reacts with water, releasing hydrogen ions (H⁺), thus increasing the acidity of the solution.