Influence of hydrotropic agents on the solute – solvent interactions in aqueous solutions of glycine at different temperatures

Smruti Pattnaik and Upendra Na

Abstract

Density (d) values of glycine have been measured at 298.15, 303.15, 308.15, and 313.15K in three different compositions (0.1, 0.2 and 0.3 wt. %) of aqueous solutions of hydrotropic agents like sodium benzoate, sodium bromide and nicotinamide.Partial molar properties of glycine, e.g., apparent molar volume (VΦ), limiting apparent molar volume (VΦ⁰), apparent molar expansibility (EΦ), and limiting apparent molar expansibility (E⁰Φ) have been evaluated in these solutions from the density data. The ultrasonic velocity (U) values in these solutions have been measured at 298.15K only. Acoustical parameters such as isentropic compressibility (Ks), apparent molar compressibility, (Ks,Φ) and solvation number (Sn) have been computed for these solutions from the values of ultrasonic velocity. The results are discussed in the light of molecular interactions in the solutions.