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At certain temperature, dissociation con...

At certain temperature, dissociation constant of formic acid and acetic acid are `1.8xx10^(-4)` and `1.8xx10^(-5)` respectively. At what concentration of acetic solution, the `H_3O^(+)` ion concentration is same as that in 0.001 M formic acid solution

A

0.001M

B

0.01M

C

0.1M

D

0.0001M

Text Solution

Verified by Experts

The correct Answer is:
B
`[H^(+)]=sqrt(CxxK_(a))=sqrt(0.001xx1.8xx10^(-4))` for formic acid
`[H^(+)]=sqrt(C_(2)xx1.8xx10^(-5))` for acetic acid Equating and solveing for `C_(2)=0.01M`.
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