A weak acid `HX` has the dissociation constant `1 xx 10^(-5)M`. It forms a salt `NaX` on reaction with alkali. The percentage hydrolysis of `0.1M` solution of `NaX` is

Options

A. `0.001 %`
B. `0.01%`
C. `0.1%`
D. `0.15%`

Answer

B

Explanation

`NaX:` Salt of weak acid, strong base.
`rArr alpha = sqrt((K_(h))/(c)) = sqrt((K_(w))/(K_(a)C)) = sqrt((10^(-14))/(10^(-5)xx0.1)) = 10^(-4)`
`rArr %` hydrolysis `= 0.01%`
(Check that approximation is valid)