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Henry's Law Constants

www.henrys-law.org

Rolf Sander

Atmospheric Chemistry Division

Max-Planck Institute for Chemistry
Mainz, Germany


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Henry's Law Constants

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

R. Sander: Compilation of Henry's law constants (version 4.0) for water as solvent, Atmos. Chem. Phys., 15, 4399-4981 (2015), doi:10.5194/acp-15-4399-2015


Converting Henry's Law Constants

Your input: Hscp = 1 mol/(m3⋅Pa) (aq-concentration / partial pressure)

Conversion to Henry's law solubility constants Hs yields:

Hscp = 1 mol/(m3⋅Pa) (aq-concentration / partial pressure)
Hscp = 101.325 M/atm (aq-concentration / partial pressure)
Hscc = 2478.96 (aq-concentration / gas-concentration)
Hsbp = 0.00100301 mol/(kg⋅Pa) (molality / partial pressure)
Hsbp = 101.63 mol/(kg⋅atm) (molality / partial pressure)
Hsxp = 1.83089 atm-1 (molar fraction / partial pressure)
α = 2271.1 (Bunsen coefficient)

Conversion to Henry's law volatility constants Hv yields:

Hvpx = 0.546182 atm (partial pressure / molar fraction)
Hvpc = 1 m3⋅Pa/mol (partial pressure / aq-concentration)
Hvpc = 9.86923E-06 m3⋅atm/mol (partial pressure / aq-concentration)
Hvcc = 0.000403395 (gas-concentration / aq-concentration)

All conversions are calculated at a temperature of T = 298.15 K and a solution density of ϱ = 997 kg/m3, using the conversion factors from Sander (2015) as shown in the following tables.

Table 1: Conversion factors between several Henry's law solubility constants Hs.

Hscp = ... molm3⋅Pa Hscp = ... Matm Hscc = ... Hsbp = ... molkg⋅Pa Hsbp = ... molkg⋅atm Hsxp = ... 1atm α = ...
Hscp = 1 molm3⋅Pa 1.00000 101.325 2478.96 1.00301E-3 101.630 1.83089 2271.10
Hscp = 1 Matm 9.86923E-3 1.00000 24.4654 9.89893E-6 1.00301 0.0180695 22.4140
Hscc = 1 4.03395E-4 0.0408740 1.00000 4.04609E-7 0.0409970 7.38573E-4 0.916150
Hsbp = 1 molkg⋅Pa 997.000 1.01021E5 2.47152E6 1.00000 1.01325E5 1825.40 2.26428E6
Hsbp = 1 molkg⋅atm 9.83962E-3 0.997000 24.3920 9.86923E-6 1.00000 0.0180153 22.3467
Hsxp = 1 1atm 0.546182 55.3419 1353.96 5.47826E-4 55.5084 1.00000 1240.43
α = 1 4.40316E-4 0.0446150 1.09152 4.41641E-7 0.0447493 8.06171E-4 1.00000

Table 2: Conversion factors between several Henry's law volatility constants Hv.

Hvpx = ... atm Hvpc = ... m3⋅Pamol Hvpc = ... m3⋅atmmol Hvcc = ...
Hvpx = 1 atm 1.00000 1.83089 1.80695E-5 7.38573E-4
Hvpc = 1 m3⋅Pamol 0.546182 1.00000 9.86923E-6 4.03395E-4
Hvpc = 1 m3⋅atmmol 55341.9 1.01325E5 1.00000 40.8740
Hvcc = 1 1353.96 2478.96 0.0244654 1.00000

Table 3: Products of Henry's law solubility constants Hs and Henry's law volatility constants Hv. For example, if Hvpx = 11.1 atm, then Hsbp 5 mol/(kg atm) because 11.1 * 5 55.5084.

Hscpmol/(m3⋅Pa) HscpM/atm Hscc1 Hsbpmol/(kg⋅Pa) Hsbpmol/(kg⋅atm) Hsxp1/atm α1
Hvpxatm 0.546182 55.3419 1353.96 5.47826E-4 55.5084 1.00000 1240.43
Hvpcm3⋅Pa/mol 1.00000 101.325 2478.96 1.00301E-3 101.630 1.83089 2271.10
Hvpcm3⋅atm/mol 9.86923E-6 1.00000E-3 0.0244654 9.89893E-9 1.00301E-3 1.80695E-5 0.0224140
Hvcc1 4.03395E-4 0.0408740 1.00000 4.04609E-7 0.0409970 7.38573E-4 0.916150

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