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The Henry's Law Constant of Trichloroacetic Acid

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Abstract

The Henry's law constant of trichloroacetic acid [K′H (mol kg-1 atm-1) for the equilibrium CCl3COOH(g) ⇌ CCl3COOH(aq)] has been determined from measured partial pressures over aqueous solutions at 298.15 K and 308.15 K. Its value is given by: ln(K′H) = (11.21 ± 0.5) – 8.66 × 103 (l/Tr – l/T) where T (K) is temperature and Tr is equal to 298.15 K, for an aqueous phase dissociation constant (Ka) of 0.55 mol kg-1 determined from literature osmotic coefficient and electromotive force data. Accuracy is estimated to be 4–30% in the product K′HKa. Trichloroacetic acid is highly soluble and will partition strongly into aqueous atmospheric aerosols, and completely into fog and cloud water. Its occurrence and transport in the environment are therefore to be associated primarily with liquid phases.

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Authors and Affiliations

  1. School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, U.K. E-mail

    Derek J. Bowden, Simon L. Clegg & Peter Brimblecombe

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  1. Derek J. Bowden
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  2. Simon L. Clegg
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  3. Peter Brimblecombe
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Bowden, D.J., Clegg, S.L. & Brimblecombe, P. The Henry's Law Constant of Trichloroacetic Acid. Water, Air, & Soil Pollution 101, 197–215 (1998). https://doi.org/10.1023/A:1004966126770

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