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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Description of key information

The dissociation constant pKa is approx. 4.75 at 25 °C.

Key value for chemical safety assessment

Additional information

There is no experimental data for dissociation constant available and the value was read-across from the two main constituents of the mixture, palmitic and stearic acid (C16 and C18, respectively).

These values for pKa were estimated by using the SPARC programm. They are cited in a peer-reviewed data base (HSDB).