Modeling heat capacities of high valence-type electrolyte solutions with Pitzer's equations

Cecil M. Criss, Frank J. Millero

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

Apparent molar heat capacities Cp,Φ for 71 rare earth chlorides, nitrates, and perchlorates, alkaline earth and transition metal chlorides, nitrates, and perchlorates, and alkali metal carbonates and sulfates have been fitted to the Pitzer equation for heat capacities. The apparent molar heat capacities at infinite dilution Cop,Φ (equal to the standard partial molar heat capacity, Cop,2) were used to evaluate a set of "best" ionic heat capacities, from which improved values of Cop,Φ for the electrolytes were calculated. These were then used in the Pitzer equation to reevaluate the higher Pitzer coefficients. The Pitzer coefficients so evaluated can express, in most cases, the behavior of Cp,Φ within experimental error from infinite dilution to the upper limit of the data. Ionic heat capacities have been correlated with the absolute entropies of the ions by statistically assigning the ionic heat capacities to obtain the best linear fit.

Original languageEnglish (US)
Pages (from-to)849-864
Number of pages16
JournalJournal of Solution Chemistry
Volume28
Issue number7
DOIs
StatePublished - Jul 1999

Keywords

  • Alkali metal sulfates
  • Apparent molar heat capacities
  • Lanthanide elements
  • Magnesium sulfate
  • Partial molar heat capacities
  • Pitzer's equations
  • Transition metals

ASJC Scopus subject areas

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

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