Activity coefficients for the system HCl + CoCl2+ H2O at 298.15 K. Effects of higher-order electrostatic terms
- 1 January 1978
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 74, 2037-2044
- https://doi.org/10.1039/f19787402037
Abstract
Activity coefficients for HCl in the system HCl + CoCl2 H2O, at 298.15 K and at constant total ionic strengths of 0.1, 0.5, 1.0, 2.0 and 3.0 mol kg–1, have been measured by an e.m.f. method. The results have been treated using Scatchard's and Pitzer's equations for mixed electrolyte solutions and activity coefficients for the salt have been derived. Although Scatchard's treatment generally gave a more accurate fit to the experimental data, the fit to Pitzer's equation, though satisfactory, could be significantly improved for the six HCl + NCl2 systems considered, provided that recognition is given to the contribution of higher-order electrostatic terms beyond the Debye–Huckel approximation to the thermodynamic properties of asymmetrical mixtures.Keywords
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