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 Orthophosphate, BiPO4






The normal salt only, BiPO4, is obtained by the addition of disodium phosphate to a nitric acid solution of bismuth nitrate. Acid salts do not appear to have been prepared. The microscopic, monoclinic prisms of the normal salt have a density of 6.323 at 15° C. The substance is slightly soluble in bismuth trichloride, and from molecular weight determinations in this solvent the formula appears to be BiPO4. It is reduced by heating in a current of hydrogen, but not by carbon monoxide. It is not hydrolysed by water, even after prolonged boiling. A trihydrate, BiPO4.3H2O, has been prepared, and also a white, insoluble basic salt, 2BiPO4.3Bi2O3. Investigation of the solubility of bismuth orthophosphate in hydrochloric acid at 25° C. indicated that it was conditioned by the concentration of the chloride ion and of the hydrogen ion, but was independent of the concentration of phosphoric acid. It is suggested that the main reaction which occurs on solution may be represented by

BiPO4 + 3HCl = H[BiCl3.H2PO4]

It has been stated that pyrophosphate and metaphosphate of bismuth cannot be prepared in the wet way owing to their rapid conversion into orthophosphate by the action of water.
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