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

C. M. Criss, Frank J Millero

Research output: Contribution to journalArticle

43 Citations (Scopus)

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[mBJ MX + m2CJ MX], where Cp.2° is the partial molal heat capacity of at infinite dilution and BMX J and CMX J 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 BMX J and CMX J 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
StatePublished - 1996

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Electrolytes
Specific heat
specific heat
electrolytes
Ions
coefficients
Activity coefficients
ions
Dilution
Enthalpy
dilution
enthalpy
interactions

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Modeling the heat capacities of aqueous 1-1 electrolyte solutions with Pitzer's equations. / Criss, C. M.; Millero, Frank J.

In: Journal of Physical Chemistry, Vol. 100, No. 4, 1996, p. 1288-1294.

Research output: Contribution to journalArticle

Criss, C. M. ; Millero, Frank J. / Modeling the heat capacities of aqueous 1-1 electrolyte solutions with Pitzer's equations. In: Journal of Physical Chemistry. 1996 ; Vol. 100, No. 4. pp. 1288-1294.
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