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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
H. S. Harned and R. A. Robinson,Multicomponent Electrolyte Solutions (Pergamon Press, London, 1968).
Y. C. Wu, M. B. Smith, and T. F. Young,J. Phys. Chem. 69, 1873 (1965).
R. H. Wood and R. W. Smith,J. Phys. Chem. 69, 2974 (1965).
H. E. Wirth, R. E. Lindstrom, and J. N. Johnson,J. Phys. Chem. 67, 2339 (1963).
A. K. Covington, T. H. Lilley, and R. A. Robinson,J. Phys. Chem. 72, 2759 (1968).
R. A. Robinson, R. F. Platford, and C. W. Childs,J. Solution Chem. 1, 167 (1972).
Y. C. Wu, R. M. Rush, and G. Scatchard,J. Phys. Chem. 73, 2047 (1969).
C. P. Bezboruah,A. K. Covington, and R. A. Robinson,J. Chem. Thermodyn. 2, 431 (1970).
R. F. Platford,J. Chem. Thermodyn. 3, 319 (1971).
J. M. Stokes,Trans. Faraday Soc. 41, 684 (1945).
C. W. Childs, C. J. Downes, and R. F. Platford,Aust. J. Chem. 26, 863 (1973).
R. F. Platford,J. Chem. Eng. Data 13, 46 (1968).
R. M. Rush and J. S. Johnson,J. Phys. Chem. 72, 767 (1968).
R. M. Rush and R. A. Robinson,J. Tenn. Acad. Sci. 43, 22 (1968).
Y. C. Wu, M. B. Smith, and T. F. Young,J. Phys. Chem. 69, 1868 (1965).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Childs, C.W., Downes, C.J. & Platford, R.F. Thermodynamics of multicomponent electrolyte solutions: Aqueous mixtures of two salts from among NaCl, KCl, NaH2PO4, and KH2PO4 at 25° C. J Solution Chem 3, 139–147 (1974). https://doi.org/10.1007/BF00646883
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00646883