IUPAC - Henry’s law solubility constant (via b and p) (09026)

Henry’s law solubility constant (via b and p)

defined via molality and partial pressure
symbol:

H_{s}^{b p}

, unit:

mol m^{- 3} {Pa}^{- 1}

https://doi.org/10.1351/goldbook.09026

Molality

b

of a species divided by the partial pressure

p

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

H_{s}^{b p} := \underset{b \to 0}{l i m} \frac{b}{p}

Notes:

The coherent SI unit for $H_{s}^{b p}$ is $mol m^{- 3} {Pa}^{- 1}$ .
Here, the symbol $b$ is used for molality (instead of $m$ ) to avoid confusion with the symbol $m$ for mass.
Molality refers to the mass of solvent and should not be confused with content which refers to the mass of solution.

Example:
The Henry solubility of ozone in water at

T = 298.15 K

H_{s}^{b p} (O_{3}) = 1.0 \times 10^{- 7} mol {kg}^{- 1} {Pa}^{- 1}

See also: Henry’s law solubility constant

Source:
PAC, 2022, 94, 71. (Henry’s law constants (IUPAC Recommendations 2021)) on page 76 [Terms] [Paper]

Citation: 'Henry’s law solubility constant (via b and p)' 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.09026 RIS BibTex EndNote

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Henry’s law solubility constant (via b and p)