Praseodymium(III) selenate

Praseodymium(III) selenate is an inorganic compound, the salt of praseodymium and selenic acid with the chemical formula Pr2(SeO4)3. It forms green crystals when hydrated.

Preparation
Praseodymium(III) selenate can be obtained by dissolving praseodymium(III) oxide in a solution of selenic acid:


 * Pr2O3 + 3 H2SeO4 -> Pr2(SeO4)3 + 3 H2O

Properties
Praseodymium(III) selenate dissolves in water, and forms green crystals when hydrated. These crystals are of Pr2(SeO4)3·nH2O, where n = 4, 5, 7, 8 and 12. During crystallization from cold solutions, the octahydrate is formed, and the pentahydrate can be formed from hot solutions.

With potassium selenate and many other selenate salts, it forms double salts such as Pr2(SeO4)3·nK2SeO4·4H2O (n = 1 and 3).