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Dissociation constant

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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.