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The dissociation constant of a substitut...

The dissociation constant of a substituted benzoic acid at `25^(@)C` is `1.0xx10^(-4)`. The `pH` of `0.01M` solution of its sodium salt is

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The correct Answer is:
8
Sodium benzoate `(C_(6)H_(5)CO ON a)` is a salt of weak acid and strong base.
`pH = 7 + (1)/(2) [pK_(a) + log c]`
`= 7 + (1)/(2) [-log 10^(-4) + log 10^(-2)]`
`= 7 + (1)/(2) (4-2) = 7 + 1 = 8`.
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