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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 a 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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