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The molar conductivities at infinite dil...

The molar conductivities at infinite dilution for sodium acetate, _hydrochloric acid and sodium cholride are 92.5,426.9 and 120.4 `S cm^2mol^(-1)` respectively at 298 K. Calculate the molar conductivity of acetic acid at infinite dilution.

Text Solution

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`lambda^@ (CH_3COOH) = lambda_H^@+lambda_(CH_3CO^(-))^@`
`implies lambda_(CH_3CO^(-))^@ +lambda_(Na)^@ +lambda_(H^(+))^@ +lambda_(Cl^(-))^@ -lambda_(Na^(+))^@ - lambda_(Cl^(-))^@`
`lambda^@ (CH_3COOH) = lambda^@ (CH_3COONa) +lambda^@ (HCl)-lambda^@ (NaCl)`
`lambda^@ (CH_3COONa) = 91.0 S cm^2 mol^(-1)`
`lambda^@ (HCl) = 425.9 S cm^2 mol^(-1)`
`lambda^@ (NaCl) =126.4 S cm^2 mol^(-1)`
`:. lambda^@(CH_3COOH) = 91.0 +425.9 - 126.4`
`= 390.5 S cm^2 mol^(-1)`
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