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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 vale of the ionization constant, Ka of this acid is :

A

`3xx10^(-1)`

B

`3xx10^(-1)`

C

`1xx10^(-5)`

D

`1xx10^(-7)`

Text Solution

Verified by Experts

The correct Answer is:
C
`HQ(aq) to H^(+)(aq) + Q^(-) (aq)`
`t=t_(eq) 0.1-10^(-3) 10^(-3) 10^(-3)`
`approx0.1`
`impliesK_(a)=(10^(-3)xx10^(-3))/0.1 = 10^(-5)`
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