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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

pka(acidic form) = 2.1

Key value for chemical safety assessment

Additional information

Based on the attached Evans's pKa table and the structure of target substance which is a sodium salt of sulfonic acids, the value for pKa is considered equal to pkA sulfonic acid = 2.1. Therefore the substance in the environmental conditions is considered completely dissociated and no further analysis is required.