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When a solution of benzoic acid was titr...

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

`6.31xx10^(-5)`

B

`3.2xx10^(-5)`

C

`8.7xx10^(-8)`

D

`6.42xx10^(-4)`

Text Solution

Verified by Experts

The correct Answer is:
A
`underset(0.5)(C_(6)H_(5)COOH)+NaOHhArrunderset(0.5)(C_(6)H_(5)COONa)+H_(2)O`
After neutralization
It is a buffer solution of weak acid and its salt
`pH=pK_(a)+log``([sal t])/([acid])pK_(a)=4.2`
`K_(a)=6.31xx10^(-5)`
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