Ionic conductances in water-sulfolane mixtures at 30°C

Conductances of solutions of triisoamyl-n-butylammonium (iAm₃BuN⁺) iodide and sodium tetraphenylboride, iodide, and bromide have been measured in water-sulfolane mixtures at 30°C. Experimental data were analyzed by the 1965 Fuoss-Onsager-Skinner equations. The limiting equivalent conductances of triisoamyl-n-butylammonium tetraphenylboride (iAm₃BuNBPh₄) in each solvent mixture were obtained by the equation $$\Lambda _0 (iAm_3 BuNBPh_4 ) = \Lambda _0 ({\text{i}}Am_3 BuNI) + \Lambda _0 (NaBPh_4 ) - \Lambda _0 (NaI)$$ Limiting ionic equivalent conductances in water-sulfolane mixtures were calculated on the assumption thatι ₀(iAm ₃ BuNBPh ₄)/2λ₀(iAm ₃ BuN ⁺)=λ₀(BPh _- ⁴ ). The variations of the limiting ionic Walden product with solvent composition are discussed with respect to current information concerning solvent structural effects and ion-solvent interaction.