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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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 dissociation constant of the substance is 6.95 at 25 °C

Key value for chemical safety assessment

Additional information

Two peer reviewed data bases reported the dissociation constant of 1-Methylimidazole as result from experimental studies to be 6,95 at 25°C (SRC PhysProp) and 7.13 at 25 °C (REAXYS). In addition a QSAR estimation was done using SPARC v4.5 with the result of 6,63 at 25°C. The value which originates from SRC PhysProp which is the peer reviewed data base is 6,95 at 25°C and regarded to be reliable for 1-Methylimidazole.