When a solution of benzoic acid was titrated with NaOH the pH of the solution when half the acid neutralized was 4.2. Dissociation constant of the acid is
A
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B
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C
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D
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Solution
The correct option is A C6H5COOH+NaOH⇌C6H5COONa+H2O 0.5 0.5 After neutralization it is a butter solution of weak acid and its salt. pH=pKa+log[Salt][acid] pKa=4.2 Ka=6.31×10−5