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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Tetrachlorophthalic anhydride hydrolysis in water forming tetrachlorophthalic acid (CAS 632-58-6). The dissociation constant for the hydrolysis product is estimated to be pKa 1 of 3.01 and pKa 2 of 0.55.

Key value for chemical safety assessment

pKa at 20°C:

Additional information

For the hydrolysis product tetrachlorophthalic acid (CAS 632-58-6) the estimated pka1 is 3.01 and pKa2 is 0.55 using the ACD 7.0 software, indicating that the substance exists predominately in its dissociated form at environmentally relevant pH.