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The dissociation constant of a substitut...

The dissociation constant of a substituted benzoic acid at `25^(@)C` is `1.0 xx 10^(-4)`. The pH of `0.01M` solution of its salt is :

Text Solution

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Sodium benzoate `(C_(6)H_(5)COONa)` is a salt of a weak acid and strong base.
`pH =7+(1)/(2)[pK_(a)+log C]=7+(1)/(2)[-log 10+log ^(-2)]`
`=7+(1)/(2)(4-2)=7+1=8`
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