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Q 1119523419.     `25` ml of a weak acid, `HA` required `15` ml of `0.1 M NaOH` for the end point. During titration, the `pH` of the acid solution is found to be `5.70` upon the addition of `10` ml of the above alkali. Find the` pK_a` of the weak acid.



A

`5.90`

B

`6.40`

C

`7.30`

D

`5.40`

HINT

Use `pH = pK_a + log(([A^−])/([HA]))`

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