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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Link to relevant study record(s)

Description of key information

Several values were found, obtained with different methods. The value retained is 4.94.

Key value for chemical safety assessment

pKa at 20°C:

Additional information

Several different values for the pKa have been found: 4 determined at 25°C, (between 4.882 and 5.0) and 3 at 20°C (between 4.78 and 4.957).

The retained value is 4.94, in the middle of the range of the values determined at 20°C.