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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

pKa: 3.13, 4.76 and 6.4 at 25°C (citric acid)

Key value for chemical safety assessment

Additional information

Trizinc dicitrate may dissociate to citrate and zinc in water. For the purposes of exposure estimation and risk characterisation, zinc and citrate are considered separately.

Dissociation constant is not relevant for the zinc ions. Citric acid/citrate has three ionisable carboxylic acid groups. pKa values of 3.13, 4.76 and 6.4 at 25°C are reported in a handbook which has been subject to peer-review and in which the original data sources are traceable. The result is considered to be reliable.