Indium(III) nitrate
Indium nitrate is a nitrate salt of indium which forms various hydrates. Only the pentahydrate has been crystallographically verified. Other hydrates are also reported in literature, such as the trihydrate.
Production and reactions
Indium nitrate hydrate is produced by the dissolution of indium metal in concentrated nitric acid followed by evaporation of the solution:The hydrate first decomposes to a basic salt and then to indium(III) oxide at 240 °C. Anhydrous indium nitrate is claimed to be produced by the reaction of anhydrous indium(III) chloride and dinitrogen pentoxide.
In the presence of excess nitrate ions, indium nitrate converts to the − ion.
The hydrolysis of indium nitrate yields indium(III) hydroxide. It also reacts with sodium tungstate to form InWO4, 2WO4, NaInWO4 or In23 depending on pH.