Transference number and conductance studies of AgNO3in water–organic solvent mixtures at 25 °C

Abstract

Transference numbers and molar conductance of AgNO3 have been measured at 25 °C in mixtures of water with methanol (MeOH), acetone (Ac), N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMA), dimethyl sulfoxide (DMSO) and pyridine (Py) with 20 mol% intervals. The limiting transference numbers of NO–3 ion ([graphic omitted]) and limiting molar conductance (Λ,0) for AgNO3 in various solvent systems have been determined. The limiting ionic conductances (λ0i) and Walden product (λ0iη) for Ag+ and NO–3 ions have been computed. The variation of Walden product for Ag+ and NO–3 ions as a function of solvent composition indicates preferential solvation of Ag+ cation by the co-solvent in H2O–DMA, H2O–DMF, H2O–DMSO and H2O–Py mixtures and the preferential hydration in H2O–MeOH and H2O–Ac mixtures. The NO–3 ion is preferentially hydrated in all these solvent mixtures.