Registration Dossier

Diss Factsheets

Physical & Chemical properties

Dissociation constant

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Dissociation constant: pKa1 = 3.51 and pKa2 = 5.03 at 20 deg C

Key value for chemical safety assessment

pKa at 20°C:

Additional information

Malic acid is a moderately strong organic acid and will dissociate in water.

While various dissociation constants have been reported for malic acid, the most reliable are regarded as being the following experimentally determined values: pKa1: 3.51 and pKa2: 5.03 at 20 deg C.