Gibbs energy of transfer and conductivity properties of NaBr solutions in mixtures of water with propan-1-ol at 298.15 K

The electrical conductivity of NaBr solutions and the emf of the cell: glas s electrode (Na)\NaBr\AgBr, Ag in the mixtures of water with propan-1-ol in the range 0-80 mol% have been measured at 298.15 K. The values of limiting molar conductance (Lambda(0)), association constants (K-A), and parameter of distance of ions (R) were obtained with the Fuoss-Justice equation. From the conductivity data obtained, the values of the Walden products (Lambda( 0)eta) were also calculated. The values of the Gibbs energy of transfer (De lta(t)G(0)) of NaBr from water to mixtures of water with propan-1-ol mixtur es were obtained from the emf data. The dependencies of limiting molar cond uctance (Lambda(0)), Walden products (Lambda(0)eta), association constants (K-A) and Gibbs energy of transfer (Delta(t)G(0)) of NaBr versus the mixed solvent composition have been discussed. The obtained results have been com pared with earlier findings for sodium chloride and iodide. (C) 1999 Elsevi er Science B.V. All rights reserved.