CONDUCTIVITY OF DILUTE AND CONCENTRATED LIASF6 SOLUTIONS IN ACETONITRILE PLUS ETHYLENE CARBONATE AND ETHYLENE CARBONATE PLUS PROPYLENE CARBONATE MIXTURES - SOME THERMODYNAMIC PROPERTIES OF PURE ACETONITRILE PLUS ETHYLENE CARBONATE MIXTURES

The specific conductivity kappa of LiAsF6 solutions in equimolar aceto nitrile + ethylene carbonate and ethylene carbonate + propylene carbon ate mixtures was determined at 25-degrees-C. The values of the density d, dynamic viscosity coefficient eta and dielectric constant D of pur e equimolar mixtures of acetonitrile (AN) with ethylene carbonate (EC) and of EC with propylene carbonate (PC) were measured at 25-degrees-C . The results for the dilute solutions were analysed using the Fuoss-J ustice conductivity equation with Chen's correction (FJCHEN equation). The limiting molar conductivity LAMBDA0, the ion pair association con stant K(A), the distance parameter R, the degree of dissociation gamma and the mean activity coefficient f+/- were calculated. The conductiv ity of the concentrated solutions was analysed using the semi-empirica l Casteel-Amis equation. The equation parameters c(max), kappa(max), a and b were evaluated. The isotherms of the vapour pressure p of the A N + EC mixtures were measured at 40-degrees-C and 60-degrees-C. The ac tivity coefficients f1 and f2 of the first and second components, the excess Gibbs energy G(E) and the excess enthalpy H(E) were evaluated f rom the experimental data. The minimized energies of the solvent molec ules were calculated using the ALCHEMY program.