Excess molar volumes, viscosity deviations and isentropic compressibility changes in glycylglycine–NiCl2 aqueous ethanol mixtures

The densities, viscosities and ultrasonic velocities for glycylglycine–NiCl2 in aqueous ethanol mixtures have been studied in the temperature range 288.15–318.15 K. The excess molar volumes, viscosity deviations and changes in isentropic compressibility for the binary mixtures have been calculated and discussed in terms of hydrogen bonding and structure-breaking effect. The computed results are fitted to the Redlich–Kister polynomial. The results clearly indicate that there is a strong association in the mixtures studied.