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Molar conductance of 0.1 M acetic acid ...

Molar conductance of ` 0.1 M` acetic acid is ` 7 ohm^(-1) cm^2 "mol"^(-1)`. If the molar conductance to acetic acid at dinfintie dilution is `380.8 "ohm"^(-1) cm^2 "mol"^(-1)`, the value of dissociation constant will be :

A

` 226 xx 10^(-5) "mol dm"^(-3)`

B

`1.66xx10^(-3) "mol dm"^(-1)`

C

`1.66 xx10^(-2) "mol dm"^(-3)`

D

` 3.33xx10^(-5) "mol dm"^(-3)`

Text Solution

Verified by Experts

The correct Answer is:
D
` Ka =C alpha^2 = 0.1 xx (7/(380.8))^2 = 3. 38 xx 10^(5)`.
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