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Q 1189112017.     `A` `40` mL solution of a weak base, `BOH` is titrated with `0.1 N HCl` solution. The `pH` of the solution is found to be `10.04` and `9.14` after the addition of `5.0 mL` and `20.0 mL` of the acid respectively. Find out the dissociation constant of the base.

JEE 1991
A

`4.6 × 10^-5`

B

`1.8 × 10^-5`

C

`2.2 × 10^-5`

D

`3.2 × 10^-5`

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