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The dissociation constant of a substitut...

The dissociation constant of a substituted benzoic acid at `25^(0)`C is `1.0 xx 10^(-4)` . Find the pH of a 0.01M Solution of its sodium salt.

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The correct Answer is:
8
Salt of weak acid and its salt with strong base.
pH ` = (1)/(2) (PK_w +PK_a +log C ) `
` = (1)/(2) (14+ 4+ log 10 ^(_2)) =(1)/(2) (16) =8`
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