Ultrasonic and thermodynamic studies of glycine in aqueous electrolytes solutions at 303 K

Densities and ultrasonic velocities of glycine (0.01–0.09 M) in aqueous NaCl and MgCl2 (0.02 and 0.06 M) solutions have been measured at 303 K. From these experimental data adiabatic compressibility Ks, apparent molar volume, ϕv apparent molar adiabatic compressibility, ϕKs, partial molar volume ϕv0 and partial molar adiabatic compressibility, ϕ0Ks at infinite dilution were calculated for all the ternary systems. The data have been interpreted in terms of solute–solute and solute–solvent interactions. These results show that dipole–dipole and ion–solvent interaction are strong in glycine–aqueous MgCl2 than in glycine–aqueous NaCl.