Volumetric and Ultrasonic Studies on Interionic Interactions of some Amino Acids in Aqueous Magnesium Acetate Medium at 306.15K

Abstract

The experimental measurements of density (r), viscosity (h) and Ultrasonic velocity (U)  have been carried out on the amino acids,  namely,  L-valine, L-lysine and L-histidine which have been mixed with various molar concentrations in aqueous magnesium acetate solution in different molarities (0M, 0.4M & 0.8M) at a temperature of 306.15K. Using these experimental values, the acoustical parameters such as adiabatic compressibility (b), molar hydration number (n_H), apparent molar compressibility (j_K), apparent molar volume (j_V), limiting apparent molar compressibility ( ), limiting apparent molar volume ( ) and the constants (S_K, S_V) at infinite dilution were evaluated. Transfer Volume (∆ ) at infinite dilution from water to aqueous magnesium acetate solutions has been determined. In addition, Viscosity  A  and B coefficients of Jone-Dole equation have also been evaluated from viscosity measurements. Eventually, these parameters have been critically analyzed and emphasizing  the possible interionic interactions such as ion-ion, solute-solvent, ion-solvent, solute-co-solute etc., and  discussed in terms of structure-making and structure-breaking effects of the amino acids in the solvent mixture.