sodium dihydrogen orthophosphate
potassium dihydrogen orthophosphate
multicomponent electrolyte solutions
excess energy of mixing
Springer Online Journal Archives 1860-2000
Chemistry and Pharmacology
Abstract Five of the six possible aqueous two-salt mixtures from among NaCl, KCl, NaH2PO4,and KH2PO4 have been studied by the isopiestic method at 25°C. The sixth mixture, NaCl−KCl, has been studied previously. The deviations from ideal mixing behavior are described by a series of coefficients which were found by regression analysis. The coefficients were used to calculate the excess Gibbs energies of mixing for equal ionic strength fractions of each salt and the trace activity coefficient of each salt at an ionic strength of 2 mode-kg−1. The cross-square mixing rule is obeyed within experimental uncertainty for the excess Gibbs energies of mixing.
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