A weak acid $HX$ has the dissociation constant $1 imes 10^{- 5}$ M. It forms a salt $NaX$ on reaction with alkali. The degree of hydrolysis of 0.1 M solution of Na$X$ is

Question

A weak acid $HX$ has the dissociation constant $1 	imes 10^{- 5}$ M. It forms a salt $NaX$ on reaction with alkali. The degree of hydrolysis of 0.1 M solution of Na$X$ is

Dr. Abubacker · Accepted Answer

(b)
$X^{-} + H_{2}O ightleftharpoons HX + OH^{-}$
$K_{h} = \frac{10^{- 14}}{10^{- 5}}so,\ h = \sqrt{\frac{K_{h}}{C}} = \sqrt{\frac{10^{- 9}}{10^{- 1}}} = 10^{- 4}$
$= 100 	imes 10^{- 4} = 10^{- 2}$
So, degree of hydrolysis is 0.01%

Q. A weak acid $HX$ has the dissociation constant $1 \times 10^{- 5}$ M. It forms a salt $NaX$ on reaction with alkali. The degree of hydrolysis of 0.1 M solution of Na$X$ is

Explanation

Reviewed by Dr. Abubacker

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