Investigations on the temperature dependent volumetric and ultrasonic properties of structural isomers D(+)-glucose and D(−)-fructose in aqueous dipotassium oxalate solutions

Abstract

Abstract The values of density, ρ and speed of sound, u for the saccharides that are structural isomers i.e. D(+)-glucose and D(−)-fructose in (0.2, 0.4, 0.6, and 0.8) mol·kg −1 aqueous solutions of dipotassium oxalate (K 2 C 2 O 4 ) at T \u202f=\u202f(288.15, 298.15, 308.15 and 318.15)K have been measured in the present work. Various volumetric parameters such as apparent molar volume ( V ϕ ) , partial molar volume at infinite dilution ( V ϕ o ), transfer volume ( Δ V ϕ o ), have been derived from density records. Experimental values of the speed of sound were used to calculate ultrasonic parameters such as apparent molar isentropic compressibility ( K ϕ , s ), partial molar isentropic compressibility at infinite dilution ( K ϕ , s o ), and partial molar isentropic compressibility of transfer ( Δ K ϕ , s o ). The pair ( V AB , K AB ) and triplet interaction ( V ABB , K ABB ) coefficients have been calculated from transfer parameters by using McMillan-Mayer theory. The structure-making/structure-breaking affinity of the saccharides along with a detailed insight into the physicochemical interactions e.g . ion-hydrophilic, hydrophilic–hydrophilic and hydrophilic-hydrophobic interactions in the saccharide-salt system, have been retrieved through the scrutiny of these calculated parameters.