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

Bismuthyl Fluoride, BiOF






Bismuthyl Fluoride or Bismuth Oxyfluoride, BiOF, can be obtained by the decomposition of BiF3.3HF or of BiOF.2HF as described above; or by adding freshly precipitated bismuth hydroxide to hydrofluoric acid until the acid is just neutralised. It is described as a heavy, white powder, of density 7-5 at 20° C., not deliquescent, decomposed when heated to bright redness.

Bismuth trifluoride does not combine with fluorine except perhaps in traces at -80° C. If so-called "bismuthic acid" or potassium bismuthate is added to 40 per cent, hydrofluoric acid at -10° C., a colourless, very unstable solution is obtained which probably contains a compound of quinquevalent bismuth. The compound has not been isolated, as it decomposes when the solution is evaporated. It may be bismuth pentafluoride, BiF5, but it appears more probable that it is mainly bismuth oxytrifluoride, BiOF3. The solution has strong oxidising properties, as shown by its action on hydrochloric acid, potassium iodide and alcohol (the latter being oxidised to aldehyde). If potassium fluoride is added to the solution before evaporation, the substance Bi3O4F7.3KF separates out as small, yellow crystals; with excess of potassium fluoride, a double compound of bismuth oxytrifluoride and potassium fluoride, BiOF3.3KF, is obtained as well-formed, colourless, prismatic crystals which decompose in moist air, becoming yellow.


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