Conductivity Study of Some Thiocyanate Salts in Aqueous Binary Mixtures of Tetrahydrofuran and 1,3-Dioxolane at 298.15 K

Abstract

Abstract Electrical conductance measurements are reported for different thiocyanate salts, viz. ammonium thiocyanate (NH4CNS), sodium thiocyanate (NaCNS) and potassium thiocyanate (KCNS), sodium bromide (NaBr), sodium tetraphenylborate (NaBPh4) and tetrabutylammonium bromide (Bu4NBr) in different mole fraction of water-tetrahydrofuran (THF) and water-1,3-dioxolane (1,3-DXL) binary mixtures at 298.15 K. The conductance data have been analyzed by the Fuoss conductance equation in terms of the limiting molar conductance (Λ0 ), the association constant (KA ) and the association diameter (R). The limiting ionic conductances have been estimated from the appropriate division of the limiting molar conductivity value of the “reference electrolyte” Bu4NBPh4. Slight ionic association was found for all these electrolytes in these solvent mixtures. The results have been interpreted in terms of the formation of ion-pairs of ion–solvent interactions and structural changes in the mixed solvents.