Standard Gibbs energies of transfer of some electrolytes from water to aqueous sucrose solutions at 298.15 K

Abstract

Standard Gibbs energies of transfer, Δ_tG^⊖, of KCl, NaCl, MgCl₂ and CaCl₂ from water to aqueous solutions of 5, 10, 15, 20, 25 and 30 wt.% sucrose have been determined at 298.15 K from emf measurements of cells without liquid junctions. Data are also given for the Gibbs energies of pairwise interaction, g_NE, of the electrolytes with sucrose in water. The electrolytes are increasingly destabilized in the mixed media with increasing mole fraction of sucrose. The Gibbs energies of interaction were found to be slightly negative for KCl–sucrose and positive for other pairs in water. The experimental results are discussed in terms of solute–solvent and solute–solute interactions in ternary water–sucrose–electrolyte systems.