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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Dissociation constant

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Administrative data

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Description of key information

Aqueous acid dissociation const pKA (1)= 1.95 and pKA (2) = 10.60.

Key value for chemical safety assessment

pKa at 20°C:
1.95

Additional information

The value of the first aqueous acid dissociation constant (-COOH-) is pKA (1) = 1.95 (Knovel Critcal Tables). The value of the second aqueous acid dissociation const (-NH3 +) is pKA (2) = 10.64 (Knovel Critcal Tables).