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Physical & Chemical properties

Water solubility

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Description of key information

Water solubility (TMLA): 24.4 g/L at 20°C and pH 1.8

Key value for chemical safety assessment

Water solubility:
24.4 g/L
at the temperature of:
20 °C

Additional information

Trimellitic anhydride (TMA) undergoes practically instantaneously hydrolysis to trimellitic acid (TMLA) on contact with water. It is therefore not possible to determine the aqueous solubility of the parent anhydride and data are provided instead for the hydrolysis product TMLA.

The measured aqueous solubility of TMLA is 24.4 g/L at 20 deg C and pH 1.8 and a similar value of 2.1% (w/w) at 25 deg C is indicated in published literature. On this basis, TMLA is classed as 'very soluble' in water.

The above solubility, as function of pH, was estimated taking account of the dissociation of this acid.