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 Chromite, 3Bi2O3.2Cr2O3






Bismuth Chromite, 3Bi2O3.2Cr2O3, is prepared by heating bismuth oxychloride with chromium trioxide and water for several hours. It is a brown powder which is insoluble in water, in acids (including aqua regia) and in alkalis.

Many chromates and dichromates of bismuth have from time to time been described, but all except two are probably mixtures. These two compounds may be obtained by the action of chromic acid upon bismuth trioxide. If the concentration of the acid exceeds 7.8 moles per litre the substance Bi2O3.4CrO3 is obtained as a stable salt; if the concentration falls below that figure, this salt is hydrolysed and the substance Bi2O3.2CrO3 is obtained. The former is an orange-scarlet powder and is perhaps a mixed dichromate and chromate, Bi2Cr2O7(CrO4)2; the latter is a basic salt, and is obtained as an orange- yellow powder. It may also be prepared by the action of potassium chromate or dichromate on a nearly neutral solution of bismuth nitrate.


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