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

Errata

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 Please do not cite the old paper anymore.

Converting Henry's Law Constants

Your input: $H_{s}^{cp}$ = 1 $mol/(m^{3} ⋅Pa)$ (aq-concentration / partial pressure)

Conversion to Henry's law solubility constants $H_{s}$ yields:

$H_{s}^{cp}$ =	1	$mol/(m^{3} ⋅Pa)$	(aq-concentration / partial pressure)
$H_{s}^{cp}$ =	101.325	$M/atm$	(aq-concentration / partial pressure)
$H_{s}^{cc}$ =	2478.96		(aq-concentration / gas-concentration)
$H_{s}^{bp}$ =	0.00100301	$mol/(kg⋅Pa)$	(molality / partial pressure)
$H_{s}^{bp}$ =	101.63	$mol/(kg⋅atm)$	(molality / partial pressure)
$H_{s}^{xp}$ =	1.83089	${atm}^{-1}$	(molar fraction / partial pressure)
$α$ =	2271.1		(Bunsen coefficient)

Conversion to Henry's law volatility constants $H_{v}$ yields:

$H_{v}^{px}$ =	0.546182	$atm$	(partial pressure / molar fraction)
$H_{v}^{pc}$ =	1	$m^{3} ⋅Pa/mol$	(partial pressure / aq-concentration)
$H_{v}^{pc}$ =	9.86923E-06	$m^{3} ⋅atm/mol$	(partial pressure / aq-concentration)
$H_{v}^{cc}$ =	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 (2023) as shown in the following tables.

Table 1: Conversion factors between several Henry's law solubility constants $H_{s}$ .

	$H_{s}^{cp}$ = ... $\frac{mol}{m^{3} ⋅Pa}$	$H_{s}^{cp}$ = ... $\frac{M}{atm}$	$H_{s}^{cc}$ = ...	$H_{s}^{bp}$ = ... $\frac{mol}{kg⋅Pa}$	$H_{s}^{bp}$ = ... $\frac{mol}{kg⋅atm}$	$H_{s}^{xp}$ = ... $\frac{1}{atm}$	α = ...
$H_{s}^{cp}$ = 1 $\frac{mol}{m^{3} ⋅Pa}$	1.00000	101.325	2478.96	1.00301E-3	101.630	1.83089	2271.10
$H_{s}^{cp}$ = 1 $\frac{M}{atm}$	9.86923E-3	1.00000	24.4654	9.89893E-6	1.00301	0.0180695	22.4140
$H_{s}^{cc}$ = 1	4.03395E-4	0.0408740	1.00000	4.04609E-7	0.0409970	7.38573E-4	0.916150
$H_{s}^{bp}$ = 1 $\frac{mol}{kg⋅Pa}$	997.000	1.01021E5	2.47152E6	1.00000	1.01325E5	1825.40	2.26428E6
$H_{s}^{bp}$ = 1 $\frac{mol}{kg⋅atm}$	9.83962E-3	0.997000	24.3920	9.86923E-6	1.00000	0.0180153	22.3467
$H_{s}^{xp}$ = 1 $\frac{1}{atm}$	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 $H_{v}$ .

	$H_{v}^{px}$ = ... $atm$	$H_{v}^{pc}$ = ... $\frac{m^{3} ⋅Pa}{mol}$	$H_{v}^{pc}$ = ... $\frac{m^{3} ⋅atm}{mol}$	$H_{v}^{cc}$ = ...
$H_{v}^{px}$ = 1 $atm$	1.00000	1.83089	1.80695E-5	7.38573E-4
$H_{v}^{pc}$ = 1 $\frac{m^{3} ⋅Pa}{mol}$	0.546182	1.00000	9.86923E-6	4.03395E-4
$H_{v}^{pc}$ = 1 $\frac{m^{3} ⋅atm}{mol}$	55341.9	1.01325E5	1.00000	40.8740
$H_{v}^{cc}$ = 1	1353.96	2478.96	0.0244654	1.00000

Table 3: Products of Henry's law solubility constants $H_{s}$ and Henry's law volatility constants $H_{v}$ . For example, if $H_{v}^{px}$ = 11.1 atm, then $H_{s}^{bp}$ ≈ 5 mol/(kg atm) because 11.1 * 5 ≈ 55.5084.

	$\frac{H_{s}^{cp}}{mol/(m^{3} ⋅Pa)}$	$\frac{H_{s}^{cp}}{M/atm}$	$\frac{H_{s}^{cc}}{1}$	$\frac{H_{s}^{bp}}{mol/(kg⋅Pa)}$	$\frac{H_{s}^{bp}}{mol/(kg⋅atm)}$	$\frac{H_{s}^{xp}}{1/atm}$	$\frac{α}{1}$
$\frac{H_{v}^{px}}{atm}$	0.546182	55.3419	1353.96	5.47826E-4	55.5084	1.00000	1240.43
$\frac{H_{v}^{pc}}{m^{3} ⋅Pa/mol}$	1.00000	101.325	2478.96	1.00301E-3	101.630	1.83089	2271.10
$\frac{H_{v}^{pc}}{m^{3} ⋅atm/mol}$	9.86923E-6	1.00000E-3	0.0244654	9.89893E-9	1.00301E-3	1.80695E-5	0.0224140
$\frac{H_{v}^{cc}}{1}$	4.03395E-4	0.0408740	1.00000	4.04609E-7	0.0409970	7.38573E-4	0.916150

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Rolf Sander

NEW: Version 5.0.0 has been published in October 2023

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