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Praseodymium sulphate, Pr_{2}(SO_{4})_{3}
At 0°, 23.6 parts, and at 20°, 17.7 parts of the anhydrous Praseodymium sulphate, Pr_{2}(SO_{4})_{3}, can be dissolved in 100 of water.
The monoclinic octahydrate, Pr_{2}(SO_{4})_{3}.8H_{2}O, 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: 
The monoclinic pentahydrate, Pr_{2}(SO_{4})_{3}.5H_{2}O, 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): 
The transitionpoint (from octa to pentahydrate) is about 75°. Two labile hydrates, Pr_{2}(SO_{4})_{3}.15½H_{2}O and Pr_{2}(SO_{4})_{3}.12H_{2}O, 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(HSO_{4})_{3} and Pr_{2}O_{3}.SO_{3} respectively. The following double sulphates have been described:  Pr_{2}(SO_{4})_{3}.Cs_{2}SO_{4}.2H_{2}O and Pr_{2}(SO_{4})_{3}.Cs_{2}SO_{4}.4H_{2}O; Pr_{2}(SO_{4})_{3}.K_{2}SO_{4}.4H_{2}O; Pr_{2}(SO_{4})_{3}.3K_{2}SO_{4}.H_{2}O; density 3.29 Pr_{2}(SO_{4})_{3}.(NH_{4})_{2}SO_{4}.8H_{2}O; density 2.53 
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