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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

The pKa values for the 2 main constituents of the structural analogue of the substance Reaction mass of tetrasodium phosphonoethane-1,2-dicarboxylate and hexasodium-phosphonobutane-1,2,3,4-tetracarboxylate have been calculated by the SPARC model to be from 2.22 to 3.74, at a temperature of 25°C.

Key value for chemical safety assessment

Additional information

No experimental data is available for this endpoint.

The calculated pKa values (SPARC model) for the structural analogue Reaction mass of tetrasodium phosphonoethane-1,2-dicarboxylate and hexasodium-phosphonobutane-1,2,3,4-tetracarboxylate are in the range from 2.22 to 3.74.