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Conductivity, calorimetry and phase diagram of the NaHSO<sub>4</sub>–KHSO<sub>4</sub> system

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Authors:
  • Hind, Hamma-Cugny ;
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    Department of Chemistry, Technical University of Denmark
  • Rasmussen, Søren Birk ;
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    Department of Chemistry, Technical University of Denmark
  • Rogez, J. ;
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    unknown
  • Alaoui-Elbelghiti, J. ;
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    unknown
  • Eriksen, Kim Michael ;
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    Department of Chemistry, Technical University of Denmark
  • Fehrmann, Rasmus
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    Orcid logo0000-0003-0583-5958
    Department of Chemistry, Technical University of Denmark
DOI:
10.1016/j.tca.2005.11.022
Abstract:
Physico-chemical properties of the binary system NaHSO4-KHSO4 were studied by calorimetry and conductivity, The enthalpy of mixing has been measured at 505 K in the full composition range and the phase diagram calculated. The phase diagram has also been constructed from phase transition temperatures obtained by conductivity for 10 different compositions and by differential thermal analysis. The phase diagram is of the simple eutectic type, where the eutectic is found to have the composition Χ(KHSO4)=0.44 (melting point ≈ 406 K). The conductivities in the liquid region have been fitted to polynomials of the form κ(X)=A(X)+B(X)(T-Tm)+C(X)(T-Tm)2, where Tm is the intermediate temperature of the measured temperature range and X, the mole fraction of KHSO4. The possible role of this binary system as a catalyst solvent is also discussed. (C) 2005 Elsevier B.V. All rights reserved.
Type:
Journal article
Language:
English
Published in:
Thermochimica Acta, 2006, Vol 440, Issue 2, p. 200-204
Keywords:
NaHSO4; KHSO4; Thermodynamic properties; Conductivity; Phase diagram
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2006
Scientific Level:
Scientific
ID:
8649163

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