Seawater-A test of multicomponent electrolyte solution theories. II. Enthalpy of mixing and dilution of the major sea salts

W. C. Duer, W. H. Leung, G. B. Oglesby, F. J. Millero

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

In a continuing effort to predict the physicochemical properties of seawater from the properties of single aqueous electrolyte solutions, the pairwise heats of mixing at constant molal ionic strength, I=1.0 ional, have been determined for the six possible pairs of salts from the set (NaCl, Na2SO4, MgCl2, MgSO4) at 30°C. In addition, heats of dilution for two aqueous solutions formed from these salts and having I=1.0 ional have been determined at 30°C. In order to present the most thermodynamically consistent results, it was found necessary to apply a correction term to the relative apparent equivalent enthalpies given in the literature at 30°C. These correction terms derived from a consideration of published results on heats of dilution at very low concentrations. Further, in order to make predictions for seawater at 25°C, it was deemed desirable to refit existing heat-capacity data. The heats relative apparent equivalent enthalpies for the two mixtures mentioned as well as for seawater. The estimates are based on the theoretical equation of Reilly and Wood for charge-asymmetric mixtures which derives from the work of Friedman. In the most applicable cases, the estimates agree with experimental relative apparent equivalent enthalpies to within 5%. In general, the results substantiate the theoretical equation.

Original languageEnglish (US)
Pages (from-to)509-528
Number of pages20
JournalJournal of Solution Chemistry
Volume5
Issue number7
DOIs
StatePublished - Jul 1 1976

Keywords

  • Enthalpy
  • electrolyte
  • heats of dilution
  • heats of mixing
  • sea salts
  • seawater

ASJC Scopus subject areas

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

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