Question

The molar conductivities at infinite dilution `(Λ_m^∞)` for NaI, CH₃COONa and (CH₃COO)₂Mg are 126.9, 91.0 and 187.8 ohm⁻¹ cm² mol⁻¹ respectively, at 25°C. What is the molar conductivity of MgI₂ at infinite dilution?

Answer 1

`Λ_m^o(MgI_2) = Λ_m^o(CH_3COO)_2Mg + 2Λ_m^o(NaI) –  2Λ_m^o(CH_3COONa)`

= 187.8 + 2 × 126.9 – 2 (91.0)

= 187.8 + 253.8 – 182

= 441.6 – 182

= 259.6 S cm² mol⁻¹