Density, Ultrasonic Velocity, Isentropic Compressibility, Molar Volumes and Related Excess Parameters Studies on Ethyl Acetate with 1-Ethanol at 303K, 308K, and 313K

A binary liquid mixture that consists of ethyl acetate and 1-ethanol has been prepared at various concentrations by the mole fraction method. The ultrasonic velocity and density have been determined at 303K, 308K and 313K. From the experimental data, the excess isentropic compressibility, excess molar volumes, excess internal pressures, and excess molar enthalpy have been computed. The variations were observed as polynomial and fitted to the Redlich-Kister polynomial functions. By using this function, adjustable parameters and the standard deviations have been calculated. The experimental and theoretical data reveal that the existence of the intermolecular interactions between the selected liquid system. The partial molar compressibility’s and partial molar volume also calculated at infinite dilution of the system. In general, the intermolecular forces have tended to the variations in the magnitude and sign of the excess parameters. The excess molar volume (Vme), excess isentropic compressibility (), excess internal pressure ( ) and the enthalpy ( ) show the negative magnitude at the entire range of concentrations and temperatures. The significant variations of these parameters with the mole fraction of ethyl acetate have been analysed. Furthermore, the strength of the intermolecular interactions decreased with increasing the experimental temperatures as 303K > 308K >313K.

Ultrasonic Study of Effect of Temperature and Concentration on Molecular Interaction in Ternary Liquid Mixture (Propylene Glycol + Benzene + Ethanol)

Ultrasonic velocity, density and viscosity in the ternary mixture of propylene glycol, benzene and ethanol have been measured at 303, 308, 313 and 318 K and 2 MHz. The values of excess thermo-acoustic parameters uE, ηE, Ks E , Lf E , Vm E, ZE; and the Lennard-Jones potential repulsive term exponent (n) have been calculated by using the values of measured parameters. The variation in values and signs of excess parameters with increase in concentration of propylene glycol and temperature is explained by the mechanism of changing the nature of molecular interactions between unlike molecules. Further, the experimental ultrasonic velocities are compared with theoretical values calculated by using various theories like Nomoto′s relation (NR), Schaaffs′s collision factor theory (CFT) and Jacobson′s free length theory (FLT). The relative applicability of these theories is discussed in terms of average percentage errors (APE). The average percentage errors follows the order CFT < NR < FLT at each temperature.