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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

dissociation constant
Type of information:
other: review article or handbook
Adequacy of study:
key study
Study period:
Not available
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Principles of method if other than guideline:
Not available
GLP compliance:
not specified
Dissociating properties:
20 °C
2-Ethylbutyric acid has a dissociation constant of 4.71 pKa at 20 °C. The registered substance can be regarded as a weak acid and it is expected to be dissociated in water.

Description of key information

A dissociation constant of 4.71 pKa at 20 °C was determined for 2-ethylbutyric acid. The registered substance is subsequently expected to be readily dissociated in water.

Key value for chemical safety assessment

pKa at 20°C:

Additional information