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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

The dissociation constant pKa is 9.02.

Key value for chemical safety assessment

pKa at 20°C:
9.02

Additional information

In an overview article from 1982 published data were compiled, discussed and critically evaluated by the International Union of Pure and Applied Chemistry, Analytical Chemistry Division, Commission on Equilibrium Data, J. Stary and J. 0. Liljenzin, Critical Evaluation of Equilibrium Constants Involving Acetylacetones and Its Metal Chelates.

The value can be considered reliable and suitable for use as the key study for this endpoint.