Activity coefficients for HCl + BaCl2 + H2O at different temperatures and effects of higher order electrostatic terms

Rabindra N. Roy, Susan A. Rice, Kathleen M. Vogel, Lakshmi N. Roy, Frank J. Millero

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30 Scopus citations


Activity coefficients for HCl in the system HCl + BaCl2 + H2O from 278.15 to 318.15 K and at ionic strengths between 0.005 and 4.0 mol kg-1 have been determined by an emf method using a cell without liquid junction of the type Pt;H2(g,1 atm)|HCl(m1),BaCl2(m2)|AgCl,Ag{A}. The thermodynamic properties of asymmetrical mixtures are interpreted by use of Harned's rule and Pitzer's virial coefficient approach including higher order electrostatic terms for mixed-electrolyte solutions. Pitzer's mixing parameters SθH,Ba and ψH,Ba,Cl as well as linear representations of temperature derivative δSθH,Ba/δt and δψH,Ba,Cl/δt, have been estimated. A table for the activity coefficients of BaCl2 in the experimental temperature range is reported. The results are compared with the literature data if available. Hydrochloric acid follows Harned's rule at all experimental ionic strengths and temperatures within experimental error.

Original languageEnglish (US)
Pages (from-to)7706-7710
Number of pages5
JournalJournal of physical chemistry
Issue number19
StatePublished - 1990

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry


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