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Ultrasonic study of some polar and nonpolar binary liquidmixtures

K.Prasad*, Umakant Prasad

Molecular interaction in three polar plus non-polar binary liquid mixtures (a) benzene + benzonitrile, (b) benzene +methyl propyl ketone (MPK) and (c) cyclohexane +MPK have been studied at 303.15K. Derived ultrasonic parameters isentropic compressibility (), intermolecular free length (Lf), free volume (Vf), specific acoustic impedance (Z) and their respective excess parameters E, , E Vf and ZE are computed. Relative association (RA), molar sound velocity (R) and solvation number (Sn) have also been computed. Hence the molecular interactions between the components of the three mixtures are studied, using the above parameters, over the entire composition range. It is found that the nature of interactions for the systems (a) and (b) are similar but different from that for system (c). The strength of interactions for the three systems is in decreasing order. Different ultrasonic parameters and excess values have been fitted by empirical equations with reliability better than 99%, in most of the cases.