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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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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dissociation constant
Type of information:
experimental study
Adequacy of study:
key study
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
OECD Guideline 112 (Dissociation Constants in Water)
GLP compliance:
yes (incl. QA statement)
Dissociating properties:
20 °C

The measurement of the dissociation constant (PKa) of the test item at 20°C using a test item concentration of 0.009 mol/l resulted in the following value (rounded mean value of a triple determination): pKa = 9.8

Description of key information

The dissociation constant of the substance is 9.8 at 20°C.

Key value for chemical safety assessment

pKa at 20°C:

Additional information

A GLP study was conducted (BASF SE 11L00464) in accordance with the OECD Guideline for the Testing of Chemicals 112, dissociation constants in water.

The dissociation constant of the substance was determined to be 9.8 at 20°C.