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The pK(a) of an acid HA is 4.77 and pK(b...

The `pK_(a)` of an acid HA is 4.77 and `pK_(b)` of a base of BOH is 4.75 . The pH of 0.1 M aqueous solution of the salt AB is

A

7.02

B

7.01

C

6.99

D

`7.00`

Text Solution

Verified by Experts

The correct Answer is:
B
AB is a salt of weak acid and weak base. Hence,
`pH = 7 + (1)/(2) (pK_(a)-pK_(b))`
`=7 + (1)/(2) (4.77-4.75)= 7.01`
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