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HA is a weak acid. The pH of 0.1 M HA s...

HA is a weak acid. The pH of 0.1 M HA solution is 2. What is the degree of dissociation `(alpha)` of HA ?

A

`0.5`

B

`0.2`

C

`0.1`

D

`0.301`

Text Solution

Verified by Experts

The correct Answer is:
C
pH = 2, ` :. [H^(+)] = 10^(-2) = 0.01 `
For weak acid , `[H^(+)] = alpha .C `
or `0.01 = alpha xx 0.1 hArr alpha = 0.1 `
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