Chemical elements
    Physical Properties
    Chemical Properties
      Uranium Difluoride
      Uranium Tetrafluoride
      Uranous Oxyfluoride
      Uranium Hexafluoride
      Uranyl Fluoride
      Uranium Trichloride
      Uranium Tetrachloride
      Uranium Pentachloride
      Uranyl Chloride
      Uranyl Chlorate
      Uranyl Perchlorate
      Uranium Tetrabromide
      Uranyl Bromide
      Uranium Tetra-iodide
      Uranyl Iodide
      Uranyl Iodate
      Uranous Oxide
      Uranous Hydroxide
      Uranium Pentoxide
      Urano-uranic Oxide
      Uranium Trioxide
      Ammonium Diuranate
      Ammonium Hexa-uranate
      Hydroxylamine Uranate
      Hydroxylamine Potassio-uranate
      Barium Uranate
      Barium Diuranate
      Bismuth Uranate
      Iron Uranate
      Lithium Uranate
      Potassium Uranate
      Potassium Diuranate
      Potassium Tetra-uranate
      Potassium Hexa-uranate
      Rubidium Uranate
      Silver Diuranate
      Sodium Uranate
      Sodium Diuranate
      Sodium Triuranate
      Sodium Penta-uranate
      Strontium Uranate
      Zinc Uranate
      Peruranic acid
      Ammonium Peruranate
      Barium Peruranates
      Lithium Peruranate
      Nickel Peruranate
      Potassium Peruranate
      Sodium Peruranates
      Uranium Monosulphide
      Uranium Sesquisulphide
      Uranium Disulphide
      Uranium Oxysulphide
      Uranyl Sulphide
      Uranium Sulphite
      Uranyl Sulphite
      Complex Uranyl Sulphites
      Uranium Sulphate
      Uranium Dithionates
      Uranyl Sulphate
      Uranyl Pyrosulphate
      Uranyl Thiosulphate
      Uranyl Dithionate
      Uranium Sesquiselenide
      Uranium Diselenide
      Uranyl Selenide
      Uranyl Selenite
      Uranyl Selenate
      Uranium Telluride
      Uranium Nitrides
      Uranous Nitrate
      Uranyl Nitrate
      Uranium Monophosphide
      Uranous Phosphide
      Uranyl Hypophosphite
      Uranyl Phosphite
      Uranous Phosphates
      Uranyl Phosphates
      Complex Uranyl Phosphates
      Uranyl Aminophosphates
      Uranous Arsenide
      Uranyl Metarsenite
      Uranous Arsenate
      Uranyl Arsenates
      Complex Uranyl Arsenates
      Uranous Antimonide
      Uranous Antimonate
      Uranium Carbide
      Complex Uranyl Carbonates
      Ammonium Uranyl Carbonate
      Calcium Uranyl Carbonate
      Potassium Uranyl Carbonate
      Sodium Uranyl Carbonate
      Thallium Uranyl Carbonate
      Potassium Uranyl Ferrocyanide
      Uranyl Platinocyanide
      Uranyl Cyanate
      Uranyl Thiocyanate
      Uranium Silicide
      Uranium Boride
      Uranyl Perborate
    PDB 1anv-3pu4

Complex Uranyl Phosphates

The following naturally occurring phosphates have been described:

Autunite, Ca(UO2)2(PO4)2.8H2O;
Uranocircite, Ba(UO2)2(PO4)2.8H2O; and
Chalcolite, Cu(UO2)2(PO4)2.8H2O.

The last named may be prepared synthetically 1 by boiling a solution of copper acetate with uranyl phosphate and treating the precipitate with acetic acid. Corresponding salts of potassium and ammonium have been prepared. The potassium salt, KUO2PO4, may be formed by fusing together uranyl hydrogen phosphate, UO2HPO4, with potassium sulphate; or by dissolving uranic anhydride in molten potassium pyrophosphate. It is obtained as the trihydrate, KUO2PO4.3H2O, in fluorescent crystals, by the addition of potassium dihydrogen phosphate to an acid solution of uranyl nitrate; the reactants should be in the proportion KH2PO4: HNO3: UO3. The crystals are insoluble in water or acetic acid, but dissolve readily in solutions of alkali carbonates. The corresponding ammonium salt, NH4UO2PO4.3H2O, is obtained in a similar manner and has similar properties. By fusing together tripotassium phosphate and uranic anhydride the compound K4UO2(PO4)2 is obtained.

When uranyl pyrophosphate is dissolved in excess of sodium pyrophosphate solution, the freezing-point rises to a maximum corresponding with 3Na4P2O7.(UO2)2P2O7, and then descends to a minimum at 2Na4P2O7.(UO2)2P2O7. The solution up to this point exhibits none of the characteristic reactions of uranyl salts, so that complex formation has evidently taken place. If the solution is evaporated to dryness, and the resulting gummy residue treated with alcohol, a very soluble hygroscopic powder is obtained, to which Pascal gives the formula Na8[(UO2)2(P2O7)3].6H2O. If alcohol is added to a solution of sodium pyrophosphate saturated with uranyl pyrophosphate a yellow insoluble powder, of composition Na2(UO2)P2O7.H2O, is formed. The stability of these complexes decreases with rise in temperature, and they cannot therefore be obtained from boiling solutions. The anhydrous salt, Na2(UO2)P2O7, may be obtained by fusing together sodium meta- phosphate and uranic anhydride. It yields glistening yellow monoclinic prisms.

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