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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

pKa1 = 1.42 ± 0.50 (calculated for C18 homologue)

Key value for chemical safety assessment

pKa at 20°C:

Additional information

Due to difficulties to measure dissociation constants for complex UVCB mixtures with different dissociating species the dissociation constant of sodium methyl oleyl taurate was determined from the molecular structure using the ACD software tool.

The calculation was performed for the major component, the C18 -unsatd. alkyl chain length.

pKa1 refers to the acid-base equilibrium of the sulfonic acid group. The value of pKa2 lies outside the range relevant for environmental considerations and corresponds to protonation/deprotonation of the amido function.

pKa1 = 1.42 ± 0.50 (C18 homologue)

pKa2 = -0.70 ± 0.70 (C18 homologue)