Thermodynamics of phase equilibria of the K2SO4 +Rb2SO4+H2O system at 25°C |
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| Authors: | Alexander M Kalinkin Alexei V Rumyantsev |
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| Institution: | (1) Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Science Center of the Russian Academy of Sciences, 84200 Apatiry, Murmansk Region, Russia;(2) Research Institute of Chemistry, St. Petersburg State University, 198904 Petrodvorets, St. Petersburg, Russia |
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| Abstract: | Activities of water in the K2SO4+Rb2SO4+H2O system at 25°C have been measured isopiestically. On the basis of the experimental activities of water ternary parameters of the Pitzer equations have been calculated. According to our data and experimental solubility data from the literature, continous solid solutions between K2SO4 and Rb2SO4 are formed in this system. With the use of the Guggenheim polynomial for simulating excess functions of solid solutions on the basis of the original and literature solubility data, excess Gibbs energies of solid solution formation as well as a solubility diagram have been calculated. Results of the solubility calculation are in good agreement with experimental data. |
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| Keywords: | Potassium sulfate rubidium sulfate aqueous system solid solutions isopiestic method solubility Pitzer's equations Guggenheim's polynomial simulation of phase equilibria |
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