Chemical elements
  Bismuth
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Bismuth Trihydride
      Bismuth Trifluoride
      Bismuthyl Fluoride
      Bismuth Trichloride
      Bismuth Oxychloride
      Bismuth Chlorate
      Bismuthyl Perchlorates
      Bismuth Thiochloride
      Bismuth Selenochloride
      Bismuth Dibromide
      Bismuth Tribromide
      Bismuth Oxybromide
      Bismuth Thiobromide
      Bismuth Diiodide
      Bismuth Triiodide
      Bismuth Oxyiodide
      Bismuth Iodate
      Bismuth Thioiodide
      Bismuth Monoxide
      Bismuth Trioxide
      Bismuth Hydroxide
      Bismuth Tetroxide
      Bismuth Pentoxide
      Bismuth Hexoxide
      Bismuth Monosulphide
      Bismuth Trisulphide
      Bismuth Sulphites
      Bismuth Sulphate
      Bismuth Thiosulphates
      Bismuth Triselenide
      Bismuth Chromite
      Bismuth Nitride
      Bismuthyl Nitrite
      Normal Bismuth Nitrate
      Basic Bismuth Nitrate
      Bismuth Phosphide
      Bismuth Hypophosphite
      Bismuth Phosphite
      Bismuth Orthophosphate
      Bismuth Pyrophosphate
      Bismuth Thiophosphate
      Bismuth Arsenide
      Bismuth Arsenite
      Bismuth Arsenate
      Bismuth Carbonate
      Bismuth Cyanides
      Bismuth Thiocyanate
      Bismuth Chromothiocyanate
      Bismuth Orthosilicate
    Detection and Estimation

Bismuth Oxybromide, BiOBr






Bismuth Oxybromide, or Bismuthyl Bromide, BiOBr, can be obtained by the action of water on a solution of bismuth tribromide in hydrobromic acid; it is also believed to be formed by heating together bismuth tribromide and bismuth trioxide. By a suitable modification of the former method, the crystalline oxybromide may be obtained. The precipitated substance is obtained as a snow-white, amorphous powder of density (at 20° C.) 6.7. The crystalline form is colourless and transparent, density (at 15° C.) 8.082. It melts at a bright red heat, at which temperature bismuth tribromide volatilises; it darkens on exposure to light; it is insoluble in water, but dissolves in moderately dilute hydrobromic acid; it is decomposed by potassium hydroxide as follows:

BiOBr + KOHBiO.OH + KBr

Two other oxybromides have been reported, namely, Bi8O15Br6 and Bi11O13Br7 (or 7BiOBr.2Bi2O3), but their identities have not been confirmed.

Bismuth oxybromides are partially reduced to metal when heated to a dull red heat in a current of dry ammonia.

A basic salt, bismuth oxybromate, or bismuthyl bromate, BiOBrO3, has been obtained (mixed with some bismuthyl hydroxide, BiO.OH) by the prolonged action of an aqueous solution of bromic acid upon bismuth hydroxide. The mixture is a white, amorphous, insoluble powder which loses water between 150° and 200° C. and decomposes violently when strongly heated, leaving a residue of bismuth oxy-bromide. At the same time there is formed a soluble product, the solution of which decomposes on evaporation, with evolution of bromine, while the small amount of residue which is obtained decomposes at once in the air.


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