A thermodynamic model of the system HCl-HNO3-H2SO4-H2O, including solubilities of HBr, from

Research output: Journal Publications and ReviewsRGC 22 - Publication in policy or professional journal

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Author(s)

  • Kenneth S. Carslaw
  • Simon L. Clegg
  • Peter Brimblecombe

Detail(s)

Original languageEnglish
Pages (from-to)11557-11574
Journal / PublicationJournal of Physical Chemistry
Volume99
Issue number29
Publication statusPublished - 1995
Externally publishedYes

Abstract

A multicomponent mole-fraction-based thermodynamic model, together with Henry's law constants and the vapor pressure of pure water, is used to represent aqueous phase activities, vapor pressures (of H2O, HNO3, HCl, and HBr), and saturation with respect to solid phases (ice, H2SO4·nH2O, HNO3·nH2O, and HCl·H2O) in the system HCl-HBr-HNO3-H2SO4-H2O. The model is valid from 328 to -1 total solute molality for solutions containing mainly H2SO4 and HNO3. Model parameters for pure aqueous H2SO4 were adopted from a previous study, and values for HNO3-H2O, HCl-H2O, and HBr-H2O were obtained by fitting to activity and osmotic coefficients, electromotive force (emf) measurements, vapor pressures, freezing points, and thermal (enthalpy and heat capacity) data. The model was tested using measured partial pressures and solubilities of HCl in aqueous H2SO4 from >328 to 200 K, HBr solubilities in aqueous H2SO4 from ∼240 to 205 K, and HNO3 partial pressures and freezing points for HNO3-H2SO4-H2O mixtures from 273.15 to 3-H2SO4-H2O. Solubilities of HNO3, HCl, and HBr in liquid stratospheric aerosols are calculated. © 1995 American Chemical Society.

Citation Format(s)

A thermodynamic model of the system HCl-HNO3-H2SO4-H2O, including solubilities of HBr, from. / Carslaw, Kenneth S.; Clegg, Simon L.; Brimblecombe, Peter.
In: Journal of Physical Chemistry, Vol. 99, No. 29, 1995, p. 11557-11574.

Research output: Journal Publications and ReviewsRGC 22 - Publication in policy or professional journal