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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

dissociation constant
Type of information:
experimental study
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Lack of experimental details
according to guideline
other: other
Dissociating properties:
>= 11.3
Remarks on result:
other: Acid-base constant: 11.3
Executive summary:

The acid-base constant of Bisphenol A is 11.3.

Description of key information

The acid-base constant of Bisphenol A is 11.3. This result is supported by estimation with ACD software showing a pKa of 10.48 and 9.73.
Method: not specified

Key value for chemical safety assessment

pKa at 20°C:

Additional information