Study of Thermodynamic Properties in Binary Liquid Mixtures through Ultrasonic Measurement

To understand the intermolecular interactions in organic liquids and liquid mixtures, the study of ultrasonic and thermodynamic parameters are of due importance. Ultrasonic velocity, density and viscosity have been measured experimentally in the two binary mixtures of ethanol and isopropyl alcohol with benzene at different temperature over the entire composition range. The thermodynamic and other allied parameters like free length, internal pressure, enthalpy etc., have been computed and the variation of the excess parameters like excess free volume, excess internal pressure, excess enthalpy, etc., is analyzed in the light of intermolecular interactions in the mixtures. The variation of these parameters as a function of solvent composition has been discussed from the view point of intermolecular interactions present between the unlike molecules. In both the mixtures intermolecular interactions between the constituent molecules are suggested.