Indium nitrate, 2In(NO₃)₃

Indium nitrate, 2In(NO₃)₃.9H₂O. - Indium dissolves slowly in dilute, more rapidly in concentrated nitric acid, a solution of the Indium nitrate, 2In(NO₃)₃.9H₂O, being produced. In the presence of nitric acid, indium nitrate readily crystallises from the solution; but from a neutral solution it is very difficult to crystallise the salt. Indium nitrate forms colourless, deliquescent needles; it loses one-third of its water at 100° and all of it over concentrated sulphuric acid. The nitrate is easily decomposed by heat, and its aqueous solution becomes turbid, owing to the separation of basic salt, when heated (Winkler). A double nitrate is formed with ammonium nitrate.