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प्रश्न
Explain why an aqueous solution of ammonium chloride is acidic in nature? Illustrate your answer with the help of a chemical equation.
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उत्तर
An aqueous solution of ammonium chloride (NH4Cl) is acidic because it is a salt formed from a strong acid (HCl) and a weak base (NH4OH). When dissolved in water, the salt dissociates into ammonium ions \[\ce{(NH^+_4)}\] and chloride ions (Cl−). The ammonium ions act as a weak acid, reacting with water (hydrolysis) to donate a proton. This releases hydronium ions (H3O+), which lowers the pH of the solution.
\[\ce{NH^+_{4{(aq)}} + H2O_{(l)} <=> NH3_{(aq)} + H3O^+_{( aq)}}\]
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