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  4. pH of 0.01 M ammonium cyanide solution is 7.02. If 5 litres of water is added to this solution, the pH becomes :

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Q. $pH$ of $0.01\, M$ ammonium cyanide solution is $7.02$. If $5$ litres of water is added to this solution, the pH becomes :

Equilibrium

Solution:

$NH _{4} CN \longrightarrow NH _{4}^{+}+ CN ^{-}$
$pH$ of hydrolysis of salt $WA + WB$ is independent of conc. of salt.