Heat capacities of concentrated multicomponent aqueous electrolyte solutions at various temperatures

Boris S. Krumgalz, Ilan A. Malester, Irving J. Ostrich, Frank J. Millero

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The specific heat capacities of the aqueous multicomponent system NaCl +KCl+MgCl2+CaCl2 with ionic strength between 8.3 and 9.6 (resembling Dead Sea waters) were measured between 15°C and 45°C. The obtained data were fitted to an empirical equation as a function of concentration and temperature. The thermodynamic functions of the studied multicomponent system were found to be strongly influenced by changes in MgCl2 concentrations. The application of Young's rule to such concentrated systems was checked at 25°C. The calculated (by Young's rule) specific heat capacities Cp and apparent molar heat capacities Cp,φ{symbol} of these multicomponent electrolyte solutions were in reasonable agreement with the measured values (-0.008 J-g-1-K-1 and -2.6 J-mol-1-K-1, respectively).

Original languageEnglish (US)
Pages (from-to)635-649
Number of pages15
JournalJournal of Solution Chemistry
Volume21
Issue number7
DOIs
StatePublished - Jul 1 1992

Keywords

  • CaCl
  • KCl
  • MgCl
  • NaCl
  • Specific and apparent molar heat capacities
  • Young's rule
  • artificial Dead Sea waters
  • brines
  • flow calorimetry
  • mixed solutions
  • multicomponent aqueous solutions

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Physical and Theoretical Chemistry

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