Modeling the heat capacities of aqueous 1-1 electrolyte solutions with Pitzer's equations

C. M. Criss, F. J. Millero

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

The apparent molal heat capacities (φCp) of 1-1 electrolytes at 25 °C have been fitted to the Pitzer equation φcp = Cp,2° + (Aj/1.2) ln(l + 1.2/1/2) - 2RT2[mBJMX + m2CJMX], where Cp.2° is the partial molal heat capacity of at infinite dilution and BMXJ and CMXJ are empirical constants related to ion-ion interactions. The values of Cp.2° of the electrolytes have been used to determine partial molal heat capacities of ions. The coefficients BMXJ and CMXJ have been combined with Pitzer coefficients for enthalpies and osmotic coefficients to develop equations that can be used to determine activity coefficients of these electrolytes from 10 to 70 °C and from 0.1 to 2 m to within 1%.

Original languageEnglish (US)
Pages (from-to)1288-1294
Number of pages7
JournalJournal of physical chemistry
Volume100
Issue number4
DOIs
StatePublished - Jan 1 1996

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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