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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

A dissociation constant was determined for undecanedioic acid using QSAR approach: pka = 4.95

Key value for chemical safety assessment

pKa at 20°C:

Additional information

Calculation using the QSAR toolbox based on trend analysis from category members yielded a dissociation constant for undecanedioic acid: pka 1 = 4.95.