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

Chemical properties of Praseodymium





Compounds of Praseodymium

The salts of praseodymium are derived from the basic oxide Pr2O3. They are leek-green in colour, and their reflection spectra or the absorption spectra of their solutions exhibit characteristic absorption bands. The conductivities of praseodymium salts in aqueous solution are in harmony with the view that the salts are derived from a fairly strong triacid base. The following results, for example, refer to the chloride at 25° (v = dilution in litres per gram equivalent): -

PrCl3v=31.362.6125.2250.4500.81001.6
λ=05.3112.25120.1125.1130.4135.7


Praseodymium is of interest in that it forms a dioxide, PrO2. According to Brauner, the dioxide is a weak base, and gives rise to a basic sulphate, 2Pr2O4.SO3 + 2½|H2O, and a basic acetate, (CH3.CO)3.PrIVO.PrIV(OH)3 or in (CH3.CO)2.Pr2IIIO2(OH)(CO.CH3) + H2O. The same authority also mentions an acetate of the constitution (CH2.CO)2PrIIIO.O.O.PrIII(OH)(CH3.CO) + H2O.

Numerous compounds of praseodymium have been described by von Scheele.


Thermochemistry of Praseodymium

The following results have been obtained: -

2[Pr] + 3(O) = Pr2O3 + 412.4 Cals.
[Pr2O3] + 6HClaq. = 2PrCl3aq. + 3H2O + 106.2 Cals.
[Pr2O3] + 6(HCl) = 2[PrCl3] + 3[H2O] + 147.8 Cals.
[Pr2O3] + 3[H2SO4] = [Pr2(SO4)3] + 3[H2O] + 125.7 Cals.
[PrCl3] + Aq. = PrCl3aq. + 33.5 Cals.
[PrCl3.H2O] + Aq. = PrCl3aq + 28.9 Cals.
[PrCl3.7H2O] + Aq. = PrCl3Aq. + 5.3 Cals.
[Pr2(SO4)3] + Aq. = Pr2(SO4)3aq + 36.0 Cals.
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