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pK(a) of a weak acid (HA) and pB(b) of a...

`pK_(a)` of a weak acid `(HA)` and `pB_(b)` of a weak base `(BOH)` are 3.2 and 3.4 respectively. The `pH` of their salt (AB) solution is

A

`7.0`

B

`1.0`

C

`7.2`

D

`6.9`

Text Solution

Verified by Experts

The correct Answer is:
D
`pH = 7 + (1)/(2) (pK_(a)-pK_(b))=7+(1)/(2)(3.2-3.4)`
`=7-0.1=6.9`
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