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The ionisatioln constant of a mono basic...

The ionisatioln constant of a mono basic acid is `5 xx 10^(-2)`. The pH of `0.01 M` acid solution is

A

`1.30`

B

`3.30`

C

`5.0`

D

`1.65`

Text Solution

Verified by Experts

The correct Answer is:
D
`[H^(+)] = sqrt(ka.c) = sqrt(5 xx 10^(-2) xx 10^(-2))`
`= sqrt(5 xx 10^(-4)) = 2.2 xx 10^(-2)`
`P^(H) = -log[H^(+)] = P^(H) = 1.65`
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