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Following are explain by reasons : The solutionof weak base and strong acid salt is acidic. |
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Answer» Solution :The solution of `NH_4Cl` (Ammonium chloride ) is acidic . The ammonium chloride `(NH_4Cl)` being a salt of weak base `NH_4OH` and STRONG acid HCl. It dissociate completely in water `NH_4Cl_((aq)) to NH_(4(aq))^(+) + Cl_((aq))^(-)` ….(a) Ammonium ions undergo hydrolysis with water to from `NH_4OH` and `H^+` ion. `NH_(4(aq))^(+) + H_2O_((l)) HARR NH_4OH_((aq)) + H_((aq))^(+)` ...(b) Ammonium hydroxide is a weak base and therefore remaining almost unionised in solution.This results in increased of `H^+` ions CONCENTRATION in solution, If total reaction =(a)+(b) `NH_4Cl_((aq))+ H_2O_((l)) hArr NH_(4(aq))^(+) +[H_((aq))^(+) + Cl_((aq))^-]` Thus , `[H^+]` is solutionincrease and solution become acidic and the value of pH is less than 7.0 Similarly to understand EVERY weak base and strong acid salts solution in acidic. |
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