Acoustical studies on molecular interaction of ascorbic acid and aqueous sacharide solutions at different temperature

Arti Gupta*, Roli Srivastava and Archana Pandey

Department of Chemistry, C.M.P. College, University of Allahabad, Allahabad - 211002, India

*Corresponding    Author     E-mail:    dr.artig@yahoo.in

Accepted 10 September, 2012

Abstract

Densities, viscosities, ultrasonic velocities and refractive indices of aqueous solutions of glucose, galactose in aqueous ascorbic acid have been measured at 303.15, 308.15, 313.15, 318.15 and 323.15 K. Various acoustical parameters like adiabatic compressibility (β), hydration number (n_H), molar compressibility (φ_k), molar volume (φ_v) and their constants (S_K, S_V), viscosity A and B coefficient of Jones-Dole equation were calculated from the density, viscosity, ultrasonic velocity and refractive index data. The various parameters have been discussed in terms of the solute (saccharide)-co-solute (ascorbic acid) interactions and are thus used to understand the mixing effects due to these interactions. The observed excess parameter values were explained on the basis of the strength of intermolecular interactions between the components of the mixtures. Estimations of the refractive index and ultrasonic velocity have also been made using various empirical relations to study interactions between saccharides and ascorbic acid. All these parameters are used to study solute-solvent and solute-solute interactions in the aforementioned mixtures

Keywords: Ultrasonic velocity, Hydration number, Adiabatic compressibility, Molar compressibility, Ascorbic acid.