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Basic indium sulphite, In2(SO3)3.2In(OH)3

Basic indium sulphite, In2(SO3)3.2In(OH)3.5H2O, is obtained as an insoluble, white precipitate when a solution of an indium salt is boiled with sodium or ammonium sulphite. It dissolves in cold aqueous sulphurous acid, but separates out again as a crystalline powder when the solution is boiled. It loses 3H2O at 100°, and another 5H2O at 260°. At 280° sulphur dioxide begins to be evolved, and when further heated a residue of indium sesqui-oxide is ultimately obtained.

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