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Please use this identifier to cite or link to this item: http://hdl.handle.net/10198/1738

Título: Representation of salt solubility in mixed solvents: a comparison of thermodynamic models
Autor: Pinho, Simão
Macedo, Eugénia A.
Palavras-chave: Solubility
Electrolyte
Issue Date: 1996
Editora: Elsevier
Citação: Pinho, Simão; Macedo, Eugénia (1996) - Representation of salt solubility in mixed solvents: a comparison of thermodynamic models. Fluid Phase Equilibria. ISSN 0378-3812. 116:1-2 p. 209-216
Resumo: A simple and accurate apparatus for the measurement of salt solubilities in mixed solvents by an analytical method is presented. Salt solubility data have been measured for the systems water/methanol/NaCl, water/methanol/KC1 at 298.15 and 323.15 K and for the system water/ethanol/NaCl at 298.15, 323.15 and 348.15 K. To correlate the solubility data two models are proposed. One assumes that the salt in solution is in the molecular form and the original UNIQUAC model with linear temperature dependent parameters is used, the other takes into consideration the salt dissociation and the original UNIQUAC model is combined with a Pitzer-Debye-Huckel expression to take into account the long-range interaction forces. In order to simplify the solubility calculations a new formulation is presented involving the symmetric convention for all species. This makes possible the direct access to the solubility product of the salt in terms of its thermodynamic properties. Both models correlate satisfactorily the solubility data although both temperature and electrostatic effects are very important in this type of equilibrium calculations.
URI: http://hdl.handle.net/10198/1738
ISSN: 0378-3812
Versão do Editor: http://www.sciencedirect.com/science/journal/03783812
Appears in Collections:DTQB - Artigos em Revistas Indexados ao ISI

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