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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

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Diss Factsheets

Physical & Chemical properties

Dissociation constant

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Description of key information

Determination of the Dissociation Constant of FAT 40858/A TE  in Water 

Key value for chemical safety assessment

Additional information

The pKavalues were calculated at the half-neutralization point. Three pKavalues were determined by titration withSodium hydroxide solution. The titrations were performed with different concentration of sodium hydroxide to determine all pKavalues.


pKa1= 4.413 (titration with 0.01 M NaOH) at 20 ± 0.4 °C

pKa2= 6.948 (titration with 0.01 and 0.1 M NaOH) at 20 ± 0.5 °C

pKa3= 9.972 (titration with 0.1 M NaOH) at 20 ± 0.5 °C