Chemical elements
  Praseodymium
    Isotopes
    Energy
    Production
    Application
    Chemical properties
      Praseodymium fluoride
      Praseodymium chloride
      Praseodymium oxychloride
      Praseodymium bromide
      Praseodymium iodide
      Praseodymium bromate
      Praseodymium sesquioxide
      Praseodymia
      Praseodymium hydroxide
      Praseodymium dioxide
      Praseodymium sulphide
      Praseodymium sulphate
      Praseodymium dithionate
      Praseodymium selenite
      Praseodymium selenate
      Praseodymium tungstate
      Praseodymium nitride
      Praseodymium nitrate
      Praseodymium carbide
      Praseodymium carbonate
      Praseodymium ethylsulphate
      Praseodymium acetylacetonate
      Praseodymium oxalate
    PDB 1k0z-4flb

Praseodymium chloride, PrCl3






Praseodymium chloride, PrCl3, is a green, hygroscopic solid which fuses to a green liquid. The density is 4.020 at 25° C. (Baxter and Stewart).

From aqueous solution the heptahydrate, PrCl3.7H2O, separates in large, green crystals of density 2.25 at 15° (Scheele). The crystals melt at 111° C. (Baxter and Stewart). When dried over sulphuric acid, the heptahydrate rapidly passes into the hexahydrate, PrCl3.6H2O, which is slowly dehydrated to the trihydrate, PrCl3.3H2O. The monohydrate is also known. At 13.8°, 100 parts of water dissolve 103.9 parts of anhydrous chloride or 334.2 of the heptahydrate, the solution being in equilibrium with the heptahydrate (Matignon). The concentrated aqueous solution dissolves considerable quantities of rare earth oxalates.

Praseodymium aurichloride, PrCl3.AuCl3.10H2O, forms yellow crystals of specific gravity 2.60 and is readily soluble in water. The chloroplatinate, PrCl3.PtCl4.12H2O, is also a yellow crystalline salt, of density 2.41 at 16°.


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