Conductivity, calorimetry and phase diagram of the NaHSO4–KHSO4 system

Hamma-Cugny Hind, Søren Birk Rasmussen, J. Rogez, J. Alaoui-Elbelghiti, Kim Michael Eriksen, Rasmus Fehrmann

Research output: Contribution to journalJournal articleResearchpeer-review

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.

Original languageEnglish
JournalThermochimica Acta
Volume440
Issue number2
Pages (from-to)200-204
ISSN0040-6031
DOIs
Publication statusPublished - 2006

Keywords

  • NaHSO4
  • KHSO4
  • Thermodynamic properties
  • Conductivity
  • Phase diagram

Cite this

Hind, H-C., Rasmussen, S. B., Rogez, J., Alaoui-Elbelghiti, J., Eriksen, K. M., & Fehrmann, R. (2006). Conductivity, calorimetry and phase diagram of the NaHSO4–KHSO4 system. Thermochimica Acta, 440(2), 200-204. https://doi.org/10.1016/j.tca.2005.11.022