Application of a multicomponent thermodynamic model to activities and thermal properties of 0-40 mol kg-1 aqueous sulfuric acid from

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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  • Simon L. Clegg
  • Peter Brimblecombe


Original languageEnglish
Pages (from-to)43-64
Journal / PublicationJournal of Chemical and Engineering Data
Issue number1
Publication statusPublished - Jan 1995
Externally publishedYes


A multicomponent mole-fraction-based thermodynamic model has been fitted to osmotic coefficients, electromotive force measurements, degrees of dissociation of the HSO4 - ion, differential heats of dilution, heat capacities, freezing points, and tabulated partial molal enthalpies of water for aqueous H2SO4, from -1 at 1 atm pressure (1 atm = 101.325 kPa). The solution is treated as the mixture H+-HSO4 --SO4 2--H2O. The equations yield a self-consistent representation of activities, speciation, and thermal properties which, for practical applications, is readily extended to more complex mixtures. Activity products of solutions saturated with respect to solid phases H2SO4·nH2O (where n is 1, 2, 3, 4, or 6.5) are determined as functions of temperature. Thermodynamic properties and speciation are tabulated at 253.15, 273.15, 298.15, and 323.15 K.