Chemical elements
    Physical Properties
    Chemical Properties
      Indium Trifluoride
      Indium monochloride
      Indium dichloride
      Indium trichloride
      Indium oxychloride
      Indium monobromide
      Indium tribromide
      Indium oxybromide
      Indium mono-iodide
      Indium di-iodide
      Indium tri-iodide
      Indium perchlorate
      Indium iodate
      Indium sesqui-oxide
      Indium hydroxide
      Indium monosulphide
      Indium disulphide
      Indium sesquisulphide
      Indium trisulphide
      Basic indium sulphite
      Indium sulphate
      Indium sesquiselenide
      Indium selenite
      Indium selenate
      Indium telluride
      Indium silicotungstates
      Indium nitrate
      Indium phosphide
      Indium platinocyanide
      Indium oxalate
      Indium acetylacetonate
    PDB 1ind-1ind

Indium hydroxide, In(OH)3

Indium is slowly converted by air and moisture into Indium hydroxide, In(OH)3. The hydroxide may be prepared by adding ammonia to an aqueous solution of an indium salt and washing the precipitate. Other precipitants may be used instead of ammonia, e.g. potassium nitrite, hydroxylamine, and the simple aliphatic primary and secondary amines. The air-dried precipitate has the composition 2In(OH)3.3H2O, and loses 3H2O at 100°.

Freshly precipitated indium hydroxide exhibits a marked tendency to pass into the colloidal state in the absence of electrolytes. It is slightly soluble in concentrated ammonium hydroxide, and dissolves readily in alkali hydroxides. From the latter solutions it is reprecipitated on boiling or standing. When heated to redness, it leaves indium sesqui-oxide. With dilute acids it reacts to produce indium salts and water; but it possesses slight acidic properties, a magnesium indate being known. This substance, of the formula MgIn2O4.3H2O, is obtained as a white precipitate when aqueous solutions of magnesium and indium chlorides are mixed and boiled.

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