Chemical elements
  Lithium
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Lithium hydride
      Lithium chloride
      Lithium bromide
      Lithium iodide
      Lithium iodide tetrachloride
      Lithium hypochlorite
      Lithium chlorate
      Lithium perchlorate
      Lithium bromate
      Lithium iodate
      Lithium periodates
      Lithium monoxide
      Lithium peroxide
      Lithium hydroxide
      Lithium monosulphide
      Lithium polysulphides
      Lithium sulphite
      Lithium sulphate
      Lithium persulphate
      Lithium thiosulphate
      Lithium dithionate
      Lithium selenide
      Lithium selenite
      Lithium selenate
      Lithium chromate
      Lithium permanganate
      Lithium molybdates
      Lithium nitride
      Lithium hydrazoate
      Lithamide
      Lithium nitrite
      Lithium nitrate
      Lithium phosphide
      Lithium orthophosphate
      Lithium pyrophosphate
      Lithium metaphosphate
      Lithium arsenide
      Lithium meta-arsenite
      Lithium arsenate
      Lithium antimonide
      Lithium antimonate
      Lithium carbide
      Lithium carbonate
      Lithium percarbonate
      Lithium cyanide
      Lithium thiocyanate
      Lithium silicide
      Lithium silicates
      Lithium borates

Lithium orthophosphate, Li3PO4






The orthophosphate is precipitated by addition of a soluble phosphate to a boiling solution of a lithium salt, the formula of the product according to Mayer being 2Li3PO4,H2O. The dihydrate, Li3PO4,2H2O, is also known, and at 60° C. is slowly transformed into the semihydrate. Crystallization of the semihydrate from fused lithium chloride yields the anhydrous salt in crystals melting about 857° C., and with the density 2.41 at 15° C. The crystalline anhydrous salt is also obtained by fusing lithium carbonate with potassium phosphate. At 25° C. one litre of water dissolves 0.297 gram of Li3PO4.

Dilithium hydrogen phosphate has not been isolated, but Rammelsberg prepared lithium dihydrogen phosphate, LiH2PO4, by concentration of an acid solution containing lithium and phosphoric acid. The hygroscopic salt dissolves readily in water, and is converted at 200° to 250° C. into the glass-like metaphosphate, LiPO3. On slow evaporation, phosphoric-acid solutions of the dihydrogen phosphate yield deliquescent crystals of the acid phosphate, LiH2PO4,H3PO4,H2O.


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