Effect of hydrogen bond, relative permittivity and temperature on the transport properties and the association behavior of some 1:1 electrolytes in some binary mixed solvents

Abstract

Effect of hydrogen bond, relative permittivity and temperature on the transport properties and the association behavior was studied through the measurements of the specific conductance of sodium acetate, sodium propionate and sodium salicylate in 10%, 20% and 30% (w/w) methanol–water (MeOH–H 2O), ethanol–water (EtOH–H 2O) and glycerol–water (GlyOH–H 2O) mixtures at different temperatures (293, 298, 303 and 308 K). The conductivity data have been analyzed using the Lee–Wheaton conductivity equation. The molar conductance ( Λ), limiting molar conductance ( Λ 0), association constants ( K A), Walden product ( Λ 0 η 0), hydrodynamic radii ( R H), fluidity ratio( R), the activation energy of the transport process ( E a) and standard thermodynamic parameters of association (∆ G A, ∆ H A and ∆ S A) were calculated and discussed. The results show that, the molar conductance values were decreased as the relative permittivity of the solvent decreased while, the association constant increased. Also the results show that the molar conductance and the association constant values were increased as the temperature increased indicate that the association process is endothermic one. The association of the studied electrolytes was also found to affect with the hydrogen bond formation.