Acetone +NN-dimethylformamide solvent system. Part 2.—Conductance studies of some electrolytes in acetone +NN-dimethylformamide mixtures at 25 °C

Abstract

Precise equivalent conductances of Bu₄NBBu₄, Bu₄NClO₄, KI, LiI, LiClO₄ and AgClO₄ in NN-dimethylformamide (DMF), Bu₄NBBu₄, Bu₄NI, Bu₄NClO₄, KI, LiClO₄ and AgClO₄ in acetone (Ac) and Bu₄NBBu₄, Bu₄NI, Bu₄NClO₄, KI, NaI, LiI, LiClO₄ and AgClO₄ in acetone +NN-dimethylformamide (Ac + DMF) mixtures over the whole composition range at 10 mol % intervals have been measured at 25 °C. Conductance data in all the cases have been analysed using the 1957 Fuoss–Onsager equation. Limiting ion conductances have been calculated by sub-dividing Λ₀ values of Bu₄NBBu₄ into two equal parts. Evaluation of solvated radii and hence the solvation numbers of Li⁺, Na⁺, K⁺ and Ag⁺ in Ac + DMF mixtures shows strong preferential solvation by DMF of Li⁺ and Na⁺ up to 30 mol % DMF and of Ag⁺ up to 20 mol % DMF in the mixtures.