Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

The calculated pKa of guanidine is 14.00, showing that the cation part of the substance is always ionized in the environmentally-relevant pH range. As the measured pKa values of phosphoric acid are 1.97 and 6.82, also the anion part of the substance is always ionized.

Key value for chemical safety assessment

Additional information