The conductance measurements are reported for tetraalkyl ammonium halides, Me₄NCl, Me₄NBr, Me₄NI, Et₄NBr, n-Pr₄NCl, n-Pr₄NI, n-Bu₄NBr, in ethanol-water mixtures at 25, 30, 35 and 40℃. The conductance data were extrapolated by the Fuoss-Onsager conductance theory.
From the value of transference number of KCl, ionic cation and halides anion conductance can be readily separated. The effect of temperature and composition of solvent on the ionic mobility and conductance-viscosity product for cation and halide anion is discussed.
The results indicates that the halide anion, K⁺ and Me₄N⁺ ions are structure breaking ion and the structure breaking powers of these ions are maximum at 0.1 mole fraction ethanol and increase in the order Cl^-<I^-<Br^-<K⁺<Me₄N⁺. The value of limiting ionic conductance-viscosity products relative to their values for pure water, R^x_w, increase in the order Et₄N⁺<n-Pr₄N⁺<n-Bu₄N⁺.