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The pH of a 0.1 molar solution of the ac...

The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionisation constant `K_a` of this acid is

A

`1xx10^(-3)`

B

`1xx10^(-5)`

C

`1xx10^(-7)`

D

`3xx10`

Text Solution

Verified by Experts

`pH=3`, molarity=0.1(M)
`[H^+]=sqrt(K_ac)=10^(-pH)=10^(-3)`
or `10^(-3)=sqrt(K_axx0.1)` or `10^(-6)=K_axx0.1:.K_a=10^(-5)`
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