Comparative Study of Molecular Interaction in Ternary Liquid Mixtures of Polar and Non-Polar Solvents

The ultrasonic velocity (U), density (ρ) and viscosity (η) have been measured for the ternary mixture of benzene, chlorobenzene, nitrobenzene and pyridine successively with N, N-dimethylformamide in cyclohexane over the whole range of composition at different frequencies and at temperature 308 K for different concentrations of component liquids. The experimental data of velocity, density and viscosity have been used for a comparative study of the molecular interaction in the different mixtures using the excess values of parameters such as excess adiabatic compressibility (β^E), excess free length (L_f^E), excess free volume (V_f^E) and excess surface tension (S^E). Variation in the above parameters for the different mixtures is indicative of the nature of interaction between them.