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Dissociation constant

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Description of key information

The dissociation constant was measured to be 9.25 at 25 °C.

Key value for chemical safety assessment

Additional information

The dissociation constant of anhydrous ammonia was measured to be 9.25 at 25 °C (CRC Handbook, 2006).

The dissociation constant of aqueous ammonia was measured at various temperatures. At 20C, the dissociation constant is 4.767 and at 25C, the dissociation constant is 4.751 (CRC Handbook, 1999; Airgas data sheets, 2010).