Abstract
Activity coefficients of hydrochloric acid in aqueous solutions of lanthanum chloride were determined by an emf method at 25°C over an ionic strength range 0.05–3 mol-kg−1. Harned's rule was obeyed within experimental error by the acid in all the mixtures. However, the fit with Pitzer's equations was not as good as the Harned rule fit, even though the effects of higher-order electrostatic terms were considered. Activity coefficients for the salt in the mixtures were derived using the Pitzer equations and fitted to the Harned equation, whereupon Harned's rule was found to be valid for the salt up to an ionic strength of 0.3 mol-kg−1 only.
Similar content being viewed by others
References
K. S. Pitzer,J. Phys. Chem. 77, 268 (1973).
K. S. Pitzer,J. solution Chem. 4, 249 (1975).
K. H. Khoo, C. Y. Chan, and T. K. Lim,J. Solution Chem. 7, 291 (1978).
K. H. Khoo, C. Y. Chan, and T. K. Lim,J. Chem. Soc. Faraday Trans I,74, 2037 (1978).
H. S. Harned and R. Gary,J. Am. Chem. Soc. 77, 4695 (1955).
H. S. Harned and C. M. Mason,J. Am. Chem. Soc. 53, 3377 (1931).
M. Randall and G. F. Breckenridge,J. Am. Chem. Soc. 49, 1435 (1927).
M. H. Lietzke and R. W. Stoughton,J. Phys. Chem. 71, 662 (1967).
M. H. Lietzke and M. D. Danford,J. Chem. Eng. Data 17, 459 (1972).
R. A. Robinson and R. H. Stokes,Electrolyte Solutions, 2nd ed. (Butterworths, London, 1959).
C. M. Mason,J. Am. Chem. Soc. 60, 1638 (1938).
R. A. Robinson,Trans. Faraday Soc. 35, 1229 (1939).
R. G. Bates, E. A. Guggenheim, H. S. Harned, D. J. G. Ives, G. J. Janz, C. B. Monk, J. E. Prue, R. A. Robinson, R. H. Stokes, and W. F. K. Wynne-Jones,J. Chem. Phys. 25, 361 (1956);26, 222 (1957).
H. S. Harned and R. A. Robinson,Multicomponant Electolyte Solutions, 1st ed. (Pergamon Press, 1968), p.60.
H. S. Harned and B. B. Owen,The Physical Chemistry of Electrolyte Solutions, 3rd ed., (Reinhold, New York, 1958) pp. 605, 716.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Khoo, K.H., Lim, TK. & Chan, CY. Activity coefficients in aqueous mixtures of hydrochloric acid and lanthanum chloride at 25°C. J Solution Chem 10, 683–691 (1981). https://doi.org/10.1007/BF00646719
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00646719