Molecular interaction study of glycine in aqueous galactose solution and effect of sodium chloride at 298 to 318 K

Abstract

Sound speed, density and viscosity of glycine in aqueous galactose solution at varying concentrations from 0.1035 to 1.0345 m at 298, 308 and 318 K have been determined. Density, viscosity and sound speed have been measured by using pre-calibrated bicapillary pycnometer, Ostwald's viscometer and single-frequency ultrasonic interferometer at 2 MHz frequency, respectively. The derived acoustic parameters like free volume (Vf ), adiabatic compressibility (β), hydration number (nH ) and Gibbs free energy for activation (ΔG) acoustic impedance (Z), intermolecular free length (Lf ) and relative association (RA ), internal pressure (πi ), Rao's constant (R), Wada's constant (W) have been calculated from experimental data. All the measurements have been carried out in a thermostatic water bath having PT-100 sensor with circulating medium with an accuracy of ± 0.1°C. Solute–solvent interactions dominate over solute–solute interactions and, the solute–solvent interactions increase with temperature.