Thallium(III) hydroxide, , also known as thallic hydroxide, is a hydroxide of thallium. It is a reddish-brown solid.
Thallium(III) hydroxide is a very weak base; it dissociates to give the thallium(III) ion, , only in strongly acidic conditions.
Preparation Thallium(III) hydroxide can be produced by the reaction of thallium(III) chloride with sodium hydroxideGlushkova, M. A. Reaction for the formation of the hydroxide of trivalent thallium. Zhurnal Neorganicheskoi Khimii, 1959. 4: 1657-1660. or the electrochemical oxidation of in alkaline conditions.
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