In a buffer solution containing equal co...

In a buffer solution containing equal concentration of `B^- and HB` the `K_b` for `B^-` is `10^(-10).` The pH of buffer solution is.

A

10

B

7

C

6

D

4

Verified by Experts

The correct Answer is:

D

We know, `pOH =pK_(b)+log ""([B^(-)])/([HB])`
Since, `[B^-]=[HB] ("Given")`
`pOH =pK_(b) rArr pOH =10`
`pH =14-10=4`

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