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A weak base, B, has basicity constant K(...

A weak base, `B`, has basicity constant `K_(b)=2xx10^(-5)`. The `pH` of any solution in which `[B]=[BH^(+)]` is

A

`4.7`

B

`7.0`

C

`9.3`

D

`9.7`

Text Solution

Verified by Experts

The correct Answer is:
C
`B+H_(2)OhArrBH^(+)+OH^(-)`
`K_(b)=([BH^(+)][OH^(-)])/([B])` or `K_(b)=[OH^(-)]`
`POH=5-log2`
`:. pH=14-pOH=9+log2=9.3`
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