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  4. A weak acid HX (.Ka=(10)- 5.) on reaction with NaOH gives NaX. For 0.1 M aqueous solution of NaX, the % hydrolysis is

Q. A weak acid $HX \, \left(\right.K_{a}=\left(10\right)^{- 5}\left.\right)$ on reaction with NaOH gives NaX. For 0.1 M aqueous solution of NaX, the % hydrolysis is

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Solution:

$\text{X}^{-} & + & \text{H}_{2}\text{O} & \rightleftharpoons & \text{HX} & + & \text{OH}^{-} \\ 1-\text{h} & & & & \text{h} & & \text{h}$
$h=\sqrt{\frac{K_{w}}{K_{a} \times C}}=\sqrt{\frac{10^{- 14}}{10^{- 5} \times 0.1}}=10^{- 4}$
Or $10^{- 2}\%$ i.e., $0.01\%$

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