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Question

The dissociation constant of a substituted benzoic acid at 25oC is 1.0×104. Find the pH of a 0.01 M solution of its sodium salt.

A
4
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B
6
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C
8
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D
10
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Solution

The correct option is C 8
Sodium salt of benzoic acid is a strong base-weak acid salt and its pH is given as follows:

pH=(pKw+pKa+logC)2=14+422=7+21=8

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