Gibbs energy of transfer and conductivity properties of NaI solutions in mixtures of water with butan-1-ol at 298.15 K, and some physicochemical properties of mixed solvent.

The electrical conductivity of NaI solutions and the emf of the cell: glass electrode (Na) \ NaI \ AgI, Ag in mixtures of water with butan-1-ol in the range 0-1 mol% and 60-100 mol% have been measured at 298.15 K. The values of limiting molar conductance (Lambda(0)), association constants (K-A), and the parameter of distance of ions (R) were obtained with the Fuoss-Justice equation. From the conductivity data obtained, the values of the Walden pr oducts (Lambda(0)eta) were also calculated. The values of the Gibbs energy of transfer (Delta(t)G(0)) of NaI from water to mixtures of water with buta n-1-ol mixtures were obtained from the emf data. The dependencies of limiti ng molar conductance (Lambda(0)), Walden products (Lambda(0)eta), associati on constants (K-A) and Gibbs energy of transfer (Delta(t)G(0)) of NaI versu s the mixed solvent composition have been briefly discussed and compared wi th existing literature data. Densities (rho) and relative electric permitti vities (epsilon) in temperature range 288.15 K- 308.15 K as well as viscosi ties (eta) of the mixed solvent at 298.15 K have also been measured. (C) 20 00 Elsevier Science B.V. All rights reserved.