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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

pKa values could not be determined using either the titration method or the spectrophotometric method, therefore, the results of the calculation method are reported.
The following pKa values in the logarithm range of 1 - 13 for acidic and basic groups in the molecular structure of the test substance were calculated using the Perrin calculation method:
 Acidic:  5-SUBST-TETRAZOL;  pKa 4.25
Basic: 1-SUBST-IMIDAZOLE; pKa 4.83

Key value for chemical safety assessment

pKa at 20°C:

Additional information