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The equivalent conductance of M//32 solu...

The equivalent conductance of `M//32` solution of a weak monobasic acid is `8.0 ` and at infinite dilution is `400 `. The dissociation constant of this acid is :

A

`1.25xx10^(-6)`

B

`6.25xx10^(-4)`

C

`1.25xx10^(-4)`

D

`1.25xx10^(-5)`

Text Solution

Verified by Experts

The correct Answer is:
D
(d) `alpha=(Lambda_(E))/(Lambdaoverset(@)E)=((8.0" ohm"^(-1)cm^(2)"equiv"^(-1)))/((400.0" ohm"^(-1)cm^(2)" equiv"^(-1)))`
`=2xx10^(-2)`
`K=Calpha^(2)=(1)/(32)xx(2xx10^(-2))=1.25xx10^(-5)`
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