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Isopiestic Determination of the Osmotic and Activity Coefficients of the {hH2SO4 + (1 − h)Al2(SO4)3}(aq) System at T = 298.15 K. 1. Experimental Results at Stoichiometric Ionic Molality Factions h = (0.85777, 0.71534, 0.57337, 0.42985, 0.28593, and 0.14332)

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Abstract

Isopiestic vapor-pressure measurements have been made at 166 compositions of the {hH2SO4 + (1 − h)Al2(SO4)3}(aq) system at the temperature 298.15 K using H2SO4(aq) as the isopiestic reference standard, where h is the stoichiometric ionic molality fraction of H2SO4 in the mixtures that was calculated by assuming complete dissociation of both solutes. These experiments were performed up to the crystallization limits at values of h = (0.85777, 0.71534, 0.57337, 0.42985, 0.28593, and 0.14332) corresponding approximately to h = (6/7, 5/7, 4/7, 3/7, 2/7 and 1/7); the highest achieved molalities are very slightly above or close to the solubility limits because of the very limited tendency of Al2(SO4)3 to form supersaturated solutions when concentrated isothermally at 298.15 K.

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Acknowledgements

The work (LLNL preprint LLNL-JRNL-74533) was performed under the auspices of the U.S. Department of Energy by University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-ENG-48 between the years 1999 and 2004. Major support was provided by the U. S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences from 1999 to 2002. The author thanks Dr. Alexander M. Kalinkin for providing copies of references 27 and 28, Roger Martinelli for the inductively coupled plasma–atomic emission spectroscopy impurity analysis, and Frank Gouveia for preparing the plot.

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    Joseph A. Rard

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This work was performed between 1999 and 2004 while the author was employed at the Chemistry, Materials, Earth and Life Sciences Directorate, Lawrence Livermore National Laboratory, University of California, Livermore, CA 94550, USA. Lawrence Livermore National Laboratory is now managed by Lawrence Livermore National Security LLC rather than the University of California.

Appendix

Appendix

Osmotic coefficients of the {hH2SO4 + (1 − h)Al2(SO4)3}(aq) solutions at T = 298.15 K. See Tables 5, 6, 7, 8, 9 and 10.

Table 5 z = 0.21803, h = 0.14332
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Table 6 z = 0.40026, h = 0.28593
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Table 7 z = 0.556845, h = 0.42985
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Table 8 z = 0.69135, h = 0.57337
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Table 9 z = 0.80726, h = 0.71534
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Table 10 z = 0.90952, h = 0.85777
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Rard, J.A. Isopiestic Determination of the Osmotic and Activity Coefficients of the {hH2SO4 + (1 − h)Al2(SO4)3}(aq) System at T = 298.15 K. 1. Experimental Results at Stoichiometric Ionic Molality Factions h = (0.85777, 0.71534, 0.57337, 0.42985, 0.28593, and 0.14332). J Solution Chem 47, 1556–1577 (2018). https://doi.org/10.1007/s10953-018-0746-8

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