Abstract
The conductance of lithium bromide in acetone-water mixtures has been measured at different temperatures (25–40°C) in the dielectric constant range from 17.80 to 61. The association constants and centre-to-centre cation-anion distances have been calculated by a modified Fuoss-Onsager equation applicable to 2<bb is the Bjerrum parameter. The increase in ion size and the decrease in association constants with the addition of water have been interpreted in terms of the solvated dipoles which contain both solvent molecules in the sheath of solvation. The variation in Walden products and in association constants with the change in the composition of the solvent and the temperature is well represented on this model.