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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 hydrolysis reaction is `A^(-) + H_(2)O rarr AH + OH^(-)`
`K_(h) = K_(w)/K_(a) = 10^(-10)`
`[OH^(-)] = sqrt(K_(h)C) = 10^(-6)`
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