IUPAC - dimensionless Henry’s law solubility constant (09018)

dimensionless Henry’s law solubility constant

defined via amount concentrations
symbol:

H_{s}^{c c}

synonym: dimensionless Henry solubility

https://doi.org/10.1351/goldbook.09018

Amount concentration

c_{l}

of a species in the liquid phase divided by the amount concentration

c_{g}

of that species in the gas phase under equilibrium conditions at infinite dilution:

H_{s}^{c c} := \underset{c_{l} \to 0}{l i m} \frac{c_{l}}{c_{g}}

Note:
Instead of the amount concentrations

c_{l}

and

c_{g}

, the mass concentrations

γ_{l}

and

γ_{g}

might be used here. This yields the same dimensionless Henry solubility because the molar mass

M

of the solute cancels out:

γ_{l} / γ_{g} = (c_{l} M) / (c_{g} M) = c_{l} / c_{g}

Example:
The dimensionless Henry solubility of ozone in water at

T = 298.15 K

H_{s}^{c c} (O_{3}) = 0.25

See: Henry’s law solubility constant

Source:
PAC, 2022, 94, 71. (Henry’s law constants (IUPAC Recommendations 2021)) on page 74 [Terms] [Paper]

Citation: 'dimensionless Henry’s law solubility constant' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.09018 RIS BibTex EndNote

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dimensionless Henry’s law solubility constant