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 Thioiodide, BiSI






Bismuth Thioiodide, BiSI, is obtained by dissolution of bismuth trisulphide in molten bismuth triiodide, by heating together bismuth trisulphide and iodine, by heating together bismuth trisulphide, iodine and sulphur for a long time, or by the action of thioacetic acid on bismuth triiodide in the cold:

BiI3 + CH3COSH + H2O = BiSI + H3COOH + 2HI

It crystallises in small, steel-grey, metallic needles resembling bismuth glance. It is decomposed on heating to the melting point into bismuth trisulphide and triiodide. It is not acted upon by water or dilute mineral acids even on boiling; concentrated hydrochloric acid decomposes it with evolution of hydrogen sulphide, concentrated nitric acid with evolution of iodine and sulphur, iodine also being liberated by the action of warm potassium hydroxide (ammonia and other weak bases act in a similar manner, but more slowly and less completely).


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