Ion-molecular interactions in solutions of potassium and cadmium thiocyanates in N-methylpyrrolidone at 298.15 k, according to calorimetry and densitometry data

Abstract

The heat capacity and density of KNCS-N-methylpyrrolidone (MP), Cd(NCS)2-MP, and KNCS-Cd(NCS)2-MP solutions at 298.15 K are studied by means of calorimetry and densitometry. Standard partial molar heat capacities and volumes (\(\bar C^\circ _{p,2} \) and \(\bar V^\circ _2 \)) of the studied electrolytes in MP are calculated. Standard values of heat capacity \(\bar C^\circ _{p,i} \) and volume \(\bar V^\circ _i \) of NCS− ions in MP at 298.15 K are determined. Values of the heat capacity and volume changes upon the formation of the three-component system KNCS-Cd(NCS)2-MP from binary solutions are obtained and discussed.