The Temperature Dependence of the Properties of Electrolyte Solutions. III. Conductance of Various Salts at High Concentrations in Propylene Carbonate at Temperatures from − 45°C to + 25°C

Abstract

Abstract Specific conductances of Et 4 NPF 6 , Pr 4 NPF 6 , Bu 4 NPF 6 , LiPF 6 , KPF 6 , LiClO 4 , and KSCN in propylene carbonate were studied at high concentrations in the temperature range from +25°C to ‐45°C. Data are fitted by a least‐squares method to a four‐parametric empirical equation, yielding the maximum specific conductance κ max and the corresponding concentration μ. Within the frame‐work of a hydro‐dynamic model the Stokes‐radii of the ions and the solvent viscosity are found to be the most important conductance‐determining parameters, affecting both κ max and μ Ionic association in solutions with propylene carbonate as the solvent is not of significant importance. Kinetic treatment of conductance yields temperature‐dependent activation energies, but at any one temperature equal for all salts at concentration μ.