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Volumetric behavior of aqueous NaF and KF solutions up to 350‡C and 30 MPa

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Abstract

The volumetric behavior of NaF(aq) and KF(aq) has been studied as a function of temperature up to 627 K and pressures up to 30 MPa using a vibrating-tube flow densitometer. The measured densities were used to derive apparent molar volumesVΦ at concentrations up to 0.9 mol-kg-1 for NaF and up to 3mol-kg-1 for KF. Standard partial molar volumes V 02 (NaF)-and V 02 (KF) were obtained by extrapolating VΦ values to infinite dilution using the Pitzer equation truncated at the second virial coefficient. Comparison with related 1:1 and 1:2 electrolytes allows examination of the extent to which the concentration and temperature dependence of the volumes is linked with the size and charge of ions. A semiquantitative estimate of association based on the close similarity of fluorides and hydroxides is made to evaluate the effect of ion-pairing on the volumetric behavior of the fluorides.

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Authors and Affiliations

  1. Laboratoire de Thermodynamique et Génie Chimique, Université Blaise Pascal, 24, Avenue des Landais, 63177, Aubière, France

    Vladimir Majer, Marek Obšil & Jean-Pierre E. Grolier

  2. Chemistry Department, Murdoch University, 6150, Murdoch, WA, Australia

    Glenn Hefter

Authors
  1. Vladimir Majer
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  2. Marek Obšil
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  3. Glenn Hefter
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  4. Jean-Pierre E. Grolier
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On leave from the Department of Physical Chemistry, Institute of Chemical Technology, 166 28 Prague 6, Czech Republic.

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Majer, V., Obšil, M., Hefter, G. et al. Volumetric behavior of aqueous NaF and KF solutions up to 350‡C and 30 MPa. J Solution Chem 26, 847–875 (1997). https://doi.org/10.1007/BF02768262

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  • DOI: https://doi.org/10.1007/BF02768262

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