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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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 of pure sorbic acid as a function of pH in aqueous solution was determined according to OECD guideline 112.

Key value for chemical safety assessment

pKa at 20°C:

Additional information

The test was performed with the spectriphotometric method using UV absorption at a wavelength of 280 nm. The pKa of sorbic acid in aqueous solution of 20 °C was determined to be 4.65 +/- 0.04.