Solubility of HOCl in water and aqueous H2SO4 to stratospheric temperatures |
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| Authors: | T Huthwelker Th Peter B P Luo S L Clegg K S Carslaw P Brimblecombe |
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| Institution: | (1) Present address: Max Planck Institut für Chemie, Postfach 3060, 55020 Mainz, Germany;(2) School of Environmental Sciences, University of East Anglia, NR4 7TJ Norwich, U.K. |
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| Abstract: | Henry's law constants K H (mol kg–1 atm–1) for the reaction HOCl(g)=HOCl(aq) near room temperature, literature data for the associated enthalpy change, and solubilities of HOCl in aqueous H2SO4 (46 to 60 wt%) at temperatures relevant to the stratosphere (200 K T230 K) are shown to be thermodynamically consistent. Effective Henry's law constants H*=mHOCl/pHOCl, in mol kg–1 atm–1] of HOCl in aqueous H2SO4 are given by: ln(H*)=6.4946–mH2SO4(–0.04107+54.56/T)–5862 (1/To–1/T) where T(K) is temperature and To=298.15K. The activity coefficient of HOCl in aqueous H2SO4 has a simple Setchenow-type dependence upon H2SO4 molality. |
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| Keywords: | Hypochlorous acid Henry's law stratospheric aerosol solubility |
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