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Physical & Chemical properties

Dissociation constant

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Description of key information

not applicable

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

Key value for chemical safety assessment

Additional information

The substance is a salt which is a reaction product of acid and base that retain their ionic character.

In addition, the dissociation constant on the single compound (base) has been measured.

The representative compound for ammonium sulphate is referred to ammonia anhydrous with CAS number 7664-41-7.

1) Ammonia, anhydrous:

measured pKa= 9.25 at 25°C (CRC Handbook, 2006)