Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Data waiver in accordance with section 1 of REACH Annex XI

Key value for chemical safety assessment

Additional information

In accordance with section 1 of REACH Annex XI, the dissociation constant study does not need to be performed as the substance is a salt. Salts are reaction products of acids and bases that retain their ionic character. Finally, conducting a study would result in the pKa value of the corresponding acid of 'Benzenesulfonic acid, di-C10-14-alkyl derivs., calcium salts'.

For aromatic sulfonic acids such as benzosulfonic acid the pKa value is <1(source: Hodgman, C.D. 1961. Handbook of Chemistry and Physics, 43rd edition. The Chemical Rubber Publishing Company, Cleveland, Ohio).