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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Description of key information

The experimental determined dissociation constant of o-toluidine was 4.45 at 25°C.

Key value for chemical safety assessment

pKa at 20°C:

Additional information

Several results for the dissociation constant of o-toluidine were found in literature. The chosen value was experimentally determined. This value is supported by a calculated value estimated by ACD/pKa DB included in ACD/labs 14.01 Release. The results show that this substance presents mainly as neutral form under environmentally relevant pH 5 - 9.