Chemical elements
    Chemical properties
      Praseodymium fluoride
      Praseodymium chloride
      Praseodymium oxychloride
      Praseodymium bromide
      Praseodymium iodide
      Praseodymium bromate
      Praseodymium sesquioxide
      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 sulphate, Pr2(SO4)3

At 0°, 23.6 parts, and at 20°, 17.7 parts of the anhydrous Praseodymium sulphate, Pr2(SO4)3, can be dissolved in 100 of water.

The monoclinic octahydrate, Pr2(SO4)3.8H2O, is the only hydrate stable in contact with the solution from 0°-75° its solubility, in grams of anhydrous salt per 100 grams of water, is as follows: -

Temp. °C.18°35°55°75°
Grams of Pr2(SO4)319.8014.0510.407.024.20

The monoclinic pentahydrate, Pr2(SO4)3.5H2O, separates from the aqueous solution at 90°-100°. Its solubility, in grams of anhydrous sulphate per 100 grams of water, is as follows (Muthmann and Rolig): -

Temp. °C85°90°95°
Grams of Pr2(SO4)31.60 1.351.00

The transition-point (from octa- to penta-hydrate) is about 75°. Two labile hydrates, Pr2(SO4)3.15½H2O and Pr2(SO4)3.12H2O, have been isolated at low temperatures by von Scheele and by Muthmann and Rolig respectively; Brauner mentions a hexahydrate.

For acid and basic sulphates, Pr(HSO4)3 and Pr2O3.SO3 respectively.

The following double sulphates have been described: -

Pr2(SO4)3.Cs2SO4.2H2O and Pr2(SO4)3.Cs2SO4.4H2O; Pr2(SO4)3.K2SO4.4H2O; Pr2(SO4)3.3K2SO4.H2O; density 3.29 Pr2(SO4)3.(NH4)2SO4.8H2O; density 2.53

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