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Environmental fate & pathways

Henry's Law constant

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Description of key information

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
13.48
at the temperature of:
20 °C

Additional information

Henry's Law constant, with a value of 13.48 Pa.m3/mol (or 0.0054 dimensionless), was derived from a report of the gas-aqueous solubility of HCN at pH 4 and 25 degrees C. This suggests that HCN is not very soluble in water at low partial pressures.