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Question

The pH of 0.01M solution of sodium salt of a substituted benzoic acid at 25oC is:

(Ka=1.0×104 at 25oC)

A
6
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B
8
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C
10
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D
12
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Solution

The correct option is B 8
ArCOONac(1h)+H2OArCOOHch+NaOHch
[OH]=ch=cKHc=KwcKa=1014×0.01104=106
[Note:h=KHc=1014×0.01104=104]
1hh
pOH=6 and pH=8

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