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Breakdown of the rule of “linearity of water isoactivity lines” in a system containing solid solutions

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Abstract

Osmotic coefficients of water have been measured isopiestically for the entire region of homogeneous ternary solutions for the Rb2SO4−(NH4)2SO4−H2O system at 25°C. One might expect that water isoactivity lines should be straight since this system involves a continuous series of solid solutions. The related systems (K2SO4−Rb2SO4−H2O and K2SO4−(NH4)2SO4−H2O) obey the “linearity of water isoactivity lines” rule. Contrary to expectations, the Rb2SO4−(NH4)2−SO4−H2O appears to be the first water-salt system containing continuous solid solutions in which the mentioned rule is not obeyed.

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Authors and Affiliations

  1. Laboratory of Chemical Thermodynamics and Kinetics, Department of Chemistry, St., Petersburg State University, Universitetsky pr. 2, Petrodvorets, 198904, St. Petersburg, Russia

    Alexey V. Rumyantsev

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  1. Alexey V. Rumyantsev
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Rumyantsev, A.V. Breakdown of the rule of “linearity of water isoactivity lines” in a system containing solid solutions. J Solution Chem 26, 97–103 (1997). https://doi.org/10.1007/BF02439446

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  • DOI: https://doi.org/10.1007/BF02439446

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