Thermodynamics of multicomponent electrolyte solutions: Aqueous mixtures of two salts from among NaCl,KCl, NaH2PO4, and KH2PO4 at 25° C |
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| Authors: | C W Childs C J Downes R F Platford |
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| Institution: | (1) Soil Bureau, D.S.I.R., Private Bag, Lower Hutt, New Zealand;(2) Canada Centre for Inland Waters, Burlington, Ontario, Canada;(3) Division of Mineralogy, C.S.I.R.O., Canberra, Australia |
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| 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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| Keywords: | Sodium chloride potassium chloride sodium dihydrogen orthophosphate potassium dihydrogen orthophosphate multicomponent electrolyte solutions excess energy of mixing osmotic coefficients |
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