Thermodynamic and Acoustic Investigation of D-Panthenol in Homologous Series of Polyethylene Glycol at Different Temperatures

The densities and ultrasonic speed for liquid mixtures comprising homologous series of polyethylene glycol (PEG 200 and PEG 400) in aqueous D-panthenol at (0.0, 0.03, 0.06, and 0.09) mol kg−1 concentration are measured at the variation of temperatures from (293.15 to 308.15) K with Anton Paar DSA 5000 M. Various thermodynamic and acoustic parameters like intermolecular free length, acoustic impedance, adiabatic compressibility, Wada’s constant, Rao’s constant, and Van der Waal’s constant were calculated using experimental data which helped to understand the intermolecular reactions inside the ternary mixture of D-panthenol and PEG 200 and PEG 400.