Conductance studies on some alkali metal acetates in aqueous glycerol solutions

Abstract

Molar conductance of lithium acetate, sodium acetate, potassium acetate, sodium bromide, sodium tetraphenylborate and tetrabutylammonium bromide in a series of glycerol + water mixtures at temperatures from 298.15 K to 318.15 K has been reported. The limiting polar conductances, association constants and cosphere diameter have been derived from the Lee-Wheaton conductivity equation. The limiting ionic conductivities have been calculated by reference electrolyte method. Ionic conductivities of cations and anions are discussed in terms of solvent viscosity, the Stokes radii and ion-ion and ion-solvent interactions. The small values of association constants for all the electrolytes studied indicate their weak association in aqueous glycerol mixtures, which is in line with the high dielectric constants of the solvent media.