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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 the acid is

A

`1xx10^(-3)`

B

`1xx10^(-5)`

C

`1xx10^(-7)`

D

`3xx10^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`:' pH=3` and Molarity `= 0.1M`
`:' [H^(+)]= sqrt(K_(a)C)`
`[H^(+)]= 10^(-pH)=10^(-3)`
`10^(-3)= sqrt(K_(a)xx0.1)` or `10^(-6)= K_(a)xx0.1`
`:. K_(a)=10^(-5)`
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