Chemical elements
    Physical Properties
    Chemical Properties
      Osmium Octafluoride
      Osmium Hexafluoride
      Osmium Tetrafiuoride
      Osmium Dichloride
      Osmium Trichloride
      Osmium Tetrachloride
      Sodium Osmium Hexachloride
      Osmium Octachloride
      Bromides of Osmium
      Potassium Bromosmate
      Sodium Bromosmate
      Ammonium Bromosmate
      Silver Bromosmate
      Osmium Hydriodide
      Osmium Tetra-iodide
      Potassium Iodosmate
      Ammonium Iodosmate
      Osmium Monoxide
      Osmium Dihydroxide
      Osmium Sesquioxide
      Osmium Dioxide
      Osmic Acid
      Potassium Osmate
      Osmium Tetroxide
      Osmyl Derivatives
      Potassium Osmyl Chloride
      Ammonium Osmyl
      Potassium Osmyl Bromide
      Potassium Osmyl Nitrite
      Osmyl Oxy Derivatives
      Ammonium Osmyl Oxychloride
      Ammonium Osmyl Oxybromide
      Potassium Osmyl Oxynitrite
      Sodium Osmyl Oxynitrite
      Osmium Bisulphide
      Osmium Tetrasulphide
      Osmium Oxysulphide
      Osmium Sulphite
      Complex Osmisulphites
      Osmium Di-ammine Hydroxide
      Osmyl Tetra-ammine Hydroxide
      Osmyl Tetra-ammine Chloride
      Osmiamic Acid
      Potassium Osmiamate
      Potassium Nitrosochlorosmate
      Osmium Nitrite
      Potassium Osminitrite
      Sodium Osminitrite
      Ammonium Osminitrite
      Barium Osminitrite
      Osmium Cyanide
      Osmocyanic Acid
      Potassium Osmocyanide
      Barium Osmocyanide
    PDB 1hc8-3uzm

Chemical Properties of Osmium

Osmium oxidises when heated in air. The oxidation of the powdered metal begins at temperatures below 212° C. in air, and below 170° C. in oxvgen, volatile vapours of the tetroxide, OsO4, being evolved. These vapours are intensely poisonous, producing temporary blindness and other unpleasant symptoms. Osmium is also oxidised when heated in steam. It is readily dissolved by fuming nitric acid, and by aqua regia unless the osmium has previously been strongly heated.

Fluorine is without action in the cold, but upon warming combination takes place. Chlorine attacks osmium at high temperatures, the tetrachloride, OsCl4, resulting at 650° to 700° C. Bromine vapour, however, is without action upon the metal.

When fused with a mixture of peroxide and nitrate of barium or sodium, osmium is dissolved.

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