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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

1

B

7.2

C

6.9

D

7

Text Solution

Verified by Experts

The correct Answer is:
C
pH of a salt made up of weak acid and weak base is calculated by using expression
`pH=7 + ½ pK_(a)-1/2pK_(b)=7 + 3.2/2 – 3.4/2 =6.9`
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