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Physical & Chemical properties

Dissociation constant

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Description of key information

The substance is a salt.
pKa= 2.1, 7.2 and 12.4 ( of phosphoric acid)
pKa= 5 (of melanine)

Key value for chemical safety assessment

Additional information

The test substance is a salt of phosphoric acid and melanine.

The pKa values of both representative selection components are reported in secondary source related to CAS-number 7664 -38 -2 and CAS-number 108 -78 -1