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Physical & Chemical properties

Dissociation constant

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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:
3.01

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.