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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Undecylenic acid has dissociating properties.

Key value for chemical safety assessment

pKa at 20°C:

Additional information

Undecylenic acid has dissociating properties. However due to its low solubility in water, the acidity constant could not be determined for temperatures lower than 60°C. At 60°C the acidity constant of undecylenic acid is 4.85 (with ionic strentgh : 0.01 mol/L).