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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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