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Physical & Chemical properties

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

Trisodium citrate is expected to be fully dissociated to citrate and sodium in water. Dissociation constant is not relevant for the sodium 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.