Q 2616823770.     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

`K_b =6.8 xx 10^(-5)`

B

`K_b =1.8 xx 10^(-5)`

C

`K_b =3.8 xx 10^(-5)`

D

`K_b =0.8 xx 10^(-5)`

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