Abstract
Thermodynamic properties of K2HPO4/d-sucrose/water ternary solutions were investigated at 298.15 K. Water activity, osmotic coefficient, and electrolyte saturation points are determined by measuring relative humidities in the wide range of K2HPO4 molality (ranging from 0.1 to approximately 5 mol·kg–1) and for various d-sucrose contents (0.1, 0.3, 0.5, 1, 2, 3, 4, 5, and 5.5 mol·kg–1) in the ternary K2HPO4/d-sucrose/water system. The solid state was characterized using powder X-ray diffraction (XRD) and attenuated total reflection Fourier-transform infrared (ATR-FTIR) techniques. The obtained data were then analyzed using the Pitzer-Simonson-Clegg (PSC) model to determine several thermodynamic properties. These properties encompass the stoichiometric ionic mean activity coefficient of K2HPO4, excess Gibbs energy, solubility in aqueous solutions, and the Gibbs energy of transfer of K2HPO4 between water (W) and d-sucrose/water (W+S) mixtures. Furthermore, the interactions among water, d-sucrose, and K2HPO4 are also examined and discussed.
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