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Physical & Chemical properties

Water solubility

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Description of key information

Water solubility in reduced form ca 300 to 500 g/L at pH 13 under inert gas atmosphere, but solubility of the only stable form indigo is used for further calculations

Key value for chemical safety assessment

Water solubility:
0.05 mg/L
at the temperature of:
23 °C

Additional information

The test substance is synthesized and handled as an aqueous sodium hydroxide solution (pH 13) only under inert gas atmosphere. It is instable in an aqueous phase at neutral pH or as solid material on air and oxidises rapidly to indigo CAS 482-89-3.

The water solubility of indigo lies below the limit of quantification of 0.05 mg/L