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At a certain temp, the dissociation cons...

At a certain temp, the dissociation constants of HCOOH and `CH_(3)COOH` are `1.8 times 10^(-4) and 1.8 times 10^(-5)` respectively. The molarity of an `CH_(3)COOH` solution in which `H^(+)` concentration is the same as in a 0.001 M HCOOH solution is

A

0.01M

B

0.001M

C

0.1M

D

0.0001M

Text Solution

Verified by Experts

The correct Answer is:
A
`[H^+]=K_a.C`
Given `[H^+]_(HC COH]=[H^+]_(CH_3COOH]`
`K_a.C=K._aC.`
`implies `1.8 times 10^-4 times 0.001=1.8 times 10^-5 times C.`
`therefore C.=0.01M`
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