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The K(a) of a substituted benzoic acid a...

The `K_(a)` of a substituted benzoic acid at 298 K is `1 times 10^(-4)`. The pH of a 0.01 M aq. solution of its sodium salt at 298 K is

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The correct Answer is:
8
For a salt of weak acid and strong base,
`pH = 7 + (1)/(2)pK_(a) + (1)/(2) log C = 7 + (1)/(2)(-log xx 10^(-4)) + (1)/(2) log 0.01 = 8`
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