Henry's Law Constants

Rolf Sander

NEW: Version 5.0.0 has been published in October 2023

Atmospheric Chemistry Division

Max-Planck Institute for Chemistry
Mainz, Germany


Henry's Law Constants





Contact, Imprint, Acknowledgements

When referring to the compilation of Henry's Law Constants, please cite this publication:

R. Sander: Compilation of Henry's law constants (version 5.0.0) for water as solvent, Atmos. Chem. Phys., 23, 10901-12440 (2023), doi:10.5194/acp-23-10901-2023

The publication from 2023 replaces that from 2015, which is now obsolete. Please do not cite the old paper anymore.

Henry's Law ConstantsInorganic speciesChlorine (Cl) → hydrogen chloride

CAS RN:7647-01-0

Hscp d ln Hs cp / d (1/T) References Type Notes
[mol/(m3Pa)] [K]
Clegg and Brimblecombe (1986) L 121)
1.5×101 Chen et al. (1979) R
Carslaw et al. (1995) T 1) 122)
Brimblecombe and Clegg (1989) T 123)
1.1×10−2 2300 Marsh and McElroy (1985) T
Wagman et al. (1982) T 124)
2.0×10−1 Graedel and Goldberg (1983) C
2.4×10−1 Hayer et al. (2022) Q 20)
Seinfeld and Pandis (1997) ? 92)
1.9×10−1 620 Dean and Lange (1999) ? 23) 125)
7.2 2000 Pandis and Seinfeld (1989) ? 126)
2.5×101 Seinfeld (1986) ? 21)
Brimblecombe and Clegg (1988) W 105)


The first column contains Henry's law solubility constant Hscp at the reference temperature of 298.15 K.
The second column contains the temperature dependence d ln Hs cp / d (1/T), also at the reference temperature.


  • Brimblecombe, P. & Clegg, S. L.: The solubility and behaviour of acid gases in the marine aerosol, J. Atmos. Chem., 7, 1–18, doi:10.1007/BF00048251 (1988).
  • Brimblecombe, P. & Clegg, S. L.: Erratum, J. Atmos. Chem., 8, 95, doi:10.1007/BF00053818 (1989).
  • Carslaw, K. S., Clegg, S. L., & Brimblecombe, P.: A thermodynamic model of the system HCl-HNO3-H2SO4-H2O, including solubilities of HBr, from <200 to 328 K, J. Phys. Chem., 99, 11 557–11 574, doi:10.1021/J100029A039 (1995).
  • Chen, C.-C., Britt, H. I., Boston, J. F., & Evans, L. B.: Extension and application of the Pitzer equation for vapor-liquid equlibrium of aqueous electrolyte systems with molecular solutes, AIChE J., 25, 820–831, doi:10.1002/AIC.690250510 (1979).
  • Clegg, S. L. & Brimblecombe, P.: The dissociation constant and Henry’s law constant of HCl in aqueous solution, Atmos. Environ., 20, 2483–2485, doi:10.1016/0004-6981(86)90079-X (1986).
  • Dean, J. A. & Lange, N. A.: Lange’s Handbook of Chemistry, Fifteenth Edition, McGraw-Hill, Inc., ISBN 9780070163843 (1999).
  • Graedel, T. E. & Goldberg, K. I.: Kinetic studies of raindrop chemistry 1. Inorganic and organic processes, J. Geophys. Res., 88, 10 865–10 882, doi:10.1029/JC088IC15P10865 (1983).
  • Hayer, N., Jirasek, F., & Hasse, H.: Prediction of Henry’s law constants by matrix completion, AIChE J., 68, e17 753, doi:10.1002/AIC.17753 (2022).
  • Marsh, A. R. W. & McElroy, W. J.: The dissociation constant and Henry’s law constant of HCl in aqueous solution, Atmos. Environ., 19, 1075–1080, doi:10.1016/0004-6981(85)90192-1 (1985).
  • Pandis, S. N. & Seinfeld, J. H.: Sensitivity analysis of a chemical mechanism for aqueous-phase atmospheric chemistry, J. Geophys. Res., 94, 1105–1126, doi:10.1029/JD094ID01P01105 (1989).
  • Seinfeld, J. H.: Atmospheric Chemistry and Physics of Air Pollution, Wiley-Interscience Publication, NY, ISBN 0471828572 (1986).
  • Seinfeld, J. H. & Pandis, S. N.: Atmospheric Chemistry and Physics, John Wiley & Sons, Inc., ISBN 0471178160 (1997).
  • Wagman, D. D., Evans, W. H., Parker, V. B., Schumm, R. H., Halow, I., Bailey, S. M., Churney, K. L., & Nuttall, R. L.: The NBS tables of chemical thermodynamic properties; Selected values for inorganic and C1 and C2 organic substances in SI units, J. Phys. Chem. Ref. Data, 11, suppl. 2, URL (1982).


Table entries are sorted according to reliability of the data, listing the most reliable type first: L) literature review, M) measured, V) VP/AS = vapor pressure/aqueous solubility, R) recalculation, T) thermodynamical calculation, X) original paper not available, C) citation, Q) QSPR, E) estimate, ?) unknown, W) wrong. See Section 3.1 of Sander (2023) for further details.


1) A detailed temperature dependence with more than one parameter is available in the original publication. Here, only the temperature dependence at 298.15 K according to the van 't Hoff equation is presented.
20) Calculated using machine learning matrix completion methods (MCMs).
21) Several references are given in the list of Henry's law constants but not assigned to specific species.
23) The partial pressure of water vapor (needed to convert some Henry's law constants) was calculated using the formula given by Buck (1981). The quantities A and α from Dean and Lange (1999) were assumed to be identical.
92) Seinfeld and Pandis (1997) probably refer to the incorrect value given by Pandis and Seinfeld (1989).
105) The value is incorrect. See erratum by Brimblecombe and Clegg (1989).
121) Hs′ = 2.0×107 mol2/(m6 Pa)
122) Hs′ = 2.0×107×exp(9000 K (1/T−1/T)) mol2/(m6 Pa)
123) Hs′ = 2.0×107×exp(9000 K (1/T−1/T)) mol2/(m6 Pa)
124) Hs′ = 2.0×107×exp(9000 K (1/T−1/T)) mol2/(m6 Pa)
125) The data from Dean and Lange (1999) were fitted to the three-parameter equation: Hscp= exp( 9.16427 +45.13997/T −1.92853 ln(T)) mol m−3 Pa−1, with T in K.
126) Pandis and Seinfeld (1989) refer to Marsh and McElroy (1985) as the source, but the quoted value cannot be found there.

The numbers of the notes are the same as in Sander (2023). References cited in the notes can be found here.

* * *

Search Henry's Law Database

Species Search:

Identifier Search:

Reference Search:

* * *

Convert Henry's Law Constants


* * *