Transference number and conductance studies of AgNO3 in 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 (λ⁰_i) and Walden product (λ⁰_iη) 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.