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Physical & Chemical properties

Dissociation constant

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Description of key information

The dissociation constant for hydrogen cyanide is 9.36 at 20°C.

Key value for chemical safety assessment

pKa at 20°C:
9.36

Additional information

Solid potassium cyanide salt does not dissociate. However, a solution of KCN generates HCN, which dissociates with a pKa of 9.36 at 20 °C.