explain why the aqueous ammonium chloride solution is acidic in character?
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Explanation:
When ammonium chloride dissolves in water it makes ammonium ion and chloride ion. What you want to consider is the hydrolysis (reaction with water) of each ion.
Chloride is not acidic. Chloride ion doesn't hydrolyze because it is the anion of a strong acid (HCl).
Ammonium ion reacts with water to make hydronium ion (H3O+) and ammonia. It is this hydronium ion that makes the solution acidic.
NH4+ + H2O --> NH3 + H3O+
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