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 Please do not cite the old paper anymore.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) → chlorine nitrate

CAS RN:14545-72-3

Hscp d ln Hs cp / d (1/T) References Type Notes
[mol/(m3Pa)] [K]
7.0×10−2 4500 Robinson et al. (1997) Q 142)
Sander and Crutzen (1996) E 99)


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.


  • Robinson, G. N., Worsnop, D. R., Jayne, J. T., , Kolb, C. E., & Davidovits, P.: Heterogeneous uptake of ClONO2 and N2O5 by sulfuric acid solutions, J. Geophys. Res., 102, 3583–3601, doi:10.1029/96JD03457 (1997).
  • Sander, R. & Crutzen, P. J.: Model study indicating halogen activation and ozone destruction in polluted air masses transported to the sea, J. Geophys. Res., 101, 9121–9138, doi:10.1029/95JD03793 (1996).


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.


99) Fast, irreversible hydrolysis is assumed, which is equivalent to an infinite effective Henry's law constant.
142) Robinson et al. (1997) assumed that the entropy of vaporization is the same for HOCl and ClNO3 according to Trouton's rule. On their page 3592, they mention a value of 7 M atm−1 at 250 K. However, checking their Fig. 9 and applying the temperature-dependence equation from their Table 3, it seems that the value of 7 M atm−1 refers to 298 K, not 250 K.

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

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