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The equivalent conductances of two stron...

The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move freely through a solution) at `25^(@)C`are given below:
`wedge_(CH_(3)COONa^(@) = 91.0Scm^(2)//equ iv` , `wedge_HCl^(@)= 426.25cm^(2)//equiv`
What additional information/quantity one needs to calculate `overset(o)(wedge)` of an aqueous solution of acetic acid?

A

The limiting equivalent conductance of `H^(+)(lamda^(@)H^(+))`

B

`(^^)^(@)` of chloroacetic acdi `(CICH_(2)COOH)`

C

`(^^)^(@)` of NaCl

D

`(^^)^(@)` of `CH_(3)COOK`

Text Solution

Verified by Experts

The correct Answer is:
C
According to Kohlrausch's law the molar conductivity at infinity diluation `(^^)^(@)` for weak electrolyte `CH_(3)COOH` is
`(^^)_(CH_(3)COOH)^(@)=(^^)_(CH_(3)+COONa)^(@)+(^^)_(HCl)^(@)-(^^)_(NaCl)^(@)`
So for calculating the value of `(^^)_(CH_(3)COOH)^(@)` value of `^^_(CaCl)^(@)` should also be known.
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