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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

7.2

B

6.9

C

`7.0`

D

`1.0`

Text Solution

Verified by Experts

The correct Answer is:
B
The salt (AB) given is a salt is of weak acid and weak base. Hence its pH can be calculated by the formula
`:.pH=7+(1)/(2)pK_(a)-(1)/(2)pK_(b)`
`=7+(1)/(2)(3.2)-(1)/(2)(3.4)=6.9`
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