The equivalent conductances of two strong electrolytes at infinite dilution in `H_(2)O` (where ions move freely through a solution) at `25^(@)C` are given below :
`Lambda_(CH_(3)COONa)^(@) = 91.0 S cm^(2)//"equi v"`.
`Lambda_(HCl)^(@) = 426.2 S cm^(2)//"equiv"`. What additional information//quantity one need to calculate `Lambda^(@)` of an aqueous solution of acetic acid ?

Options

A. `Lambda^(@)` of `NaCl`
B. `Lambda^(@)` of `CH_(3)COOK`
C. The limiting equivalent conductance of `H^(+)(lambda_(H^(+))^(@))`
D. `Lambda^(@)` of chloroacetic acid `(ClCH_(2)COOH)`

Answer

A

Explanation

From Kohlrausch's law,
`Lambda_(CH_(3)COOH)^(@) = Lambda_(CH_(3)COONa)^(@) + Lambda_(HCl)^(@) - Lambda_(NaCl)^(@)`