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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Experimentally determined pKa value is 9.79.

Key value for chemical safety assessment

pKa at 20°C:

Additional information

Since there are three nitrogens, three pKa values were to be expected. Two experimental values (9.79 and 4.60) were determined by potentiometric titration. Two of the protonated amines may have possibly titrated as a single endpoint. Calculationed pKa values of 9.43 and 10.53 were obtained using SPARC.

Exterimentally determined value is selected as most representative.