Activity coefficients in electrolyte mixtures: HCl + ThCl4 + H2O for 5-55 °C

Rabindra N. Roy, Kathleen M. Vogel, Catherine E. Good, William B. Davis, Lakshmi N. Roy, David A. Johnson, Andrew R. Felmy, Kenneth S. Pitzer

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27 Scopus citations


The emf of the cell without liquid junction (A) was used to study the HCl + ThCl4 + H2O mixed electrolyte system. The Pt, H2(g,1 atm)|HCl(mA), ThCl4(mB)|AgCl,Ag (A) emf was measured for solutions at constant total ionic strengths of 0.006, 0.008, 0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.0, and 3.0 mol·kg-1 and at temperatures ranging from 5 to 55°C. The mean activity coefficients of HCl in the mixtures were calculated using the Nernst equation. Two detailed treatments are given of the data for 25°C. In the first, the Harned equations were fitted to the activity coefficient data using least-squares regression techniques. Results show that the quadratic equation is adequate for the full range of YB to 0.9 for I ≤ 2.0 mol·kg-1 but only for smaller YB at I = 3.0. Second, an ion-interaction (Pitzer) equation treatment is given in which experimental isopiestic measurements, solubility, and the activity coefficient data are analyzed and the necessary parameters developed for the H+-Th4+-Cl--H2O system.

Original languageEnglish (US)
Pages (from-to)11065-11072
Number of pages8
JournalJournal of physical chemistry
Issue number26
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • General Engineering
  • Physical and Theoretical Chemistry


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