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Environmental fate & pathways

Henry's Law constant

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Description of key information

The value for the Henry's Law Constant is based on read-across from the value for HCN, based on the behaviour of free cyanide in solution from potassium cyanide salt. 

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, 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.