Transport properties and density of NaI in N-methyl propionamide solutions in the temperature range 25–80°C

Abstract

The density, viscosity and electrical conductivity of concentrated NaI in N-methyl propionamide solutions have been measured in the temperature range 25–80°C. The plots of the partial molar volumes vs the salt concentration show a minimum at ∼1.2 m where a value close to the molecular volume of the pure salt is found. The experimental conductivity and viscosity data have been analyzed with the correct Arrhenius equation used in the treatment of transport in glass-forming liquids. At each concentration the glass-transition temperatures deduced from conductivity and viscosity are close value. Viscosity data were also treated following a model derived for the viscosity of suspensions of rigid spheres. The results show a solvation number of the cations in the concentrated solutions equal to 1.6.