Praseodymium(III) selenate

Praseodymium(III) selenate
Names
Other names
Praseodymium(III) selenate(VI)
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/3H2O4Se.2Pr/c3*1-5(2,3)4;;/h3*(H2,1,2,3,4);;/q;;;2*+3/p-6
    Key: RAKZQMKNASWERS-UHFFFAOYSA-H
  • [O-][Se](=O)(=O)[O-].[O-][Se](=O)(=O)[O-].[O-][Se](=O)(=O)[O-].[Pr+3].[Pr+3]
Properties
Pr2(SeO4)3
Molar mass 710.6868 g/mol (anhydrous)
782.74792 g/mol (tetrahydrate)
800.7632 g/mol (pentahydrate)
836.79376 g/mol (heptahydrate)
854.80904 g/mol (octahydrate)
926.87016 g/mol (dodecahydrate)
Appearance pale green crystals (heptahydrate)[1]
Density 4.3 g/cm3 (anhydrous)
3.85 g/cm3 (tetrahydrate)[2]
3.094 g/cm3 (octahydrate)
36 g/100 mL (0 °C)
3 g/100 mL (92 °C)
Related compounds
Other anions
 Praseodymium(III) sulfate
Other cations
 Cerium(III) selenate
Neodymium(III) selenate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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:[3]

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).

References

  1. ^ Sc, Y, La-Lu Rare Earth Elements: C 9 Compounds with Se. Springer Science & Business Media. 2013-11-11. p. 455. ISBN 978-3-662-06345-3.
  2. ^ Villars, Pierre; Cenzual, Karin; Gladyshevskii, Roman (2013-12-18). Handbook. Walter de Gruyter GmbH & Co KG. p. 1105. ISBN 978-3-11-029444-6.
  3. ^ Friend, J. Newton (1932). "352. The solubility of praseodymium selenate in water". Journal of the Chemical Society (Resumed): 2410–2413. doi:10.1039/jr9320002410. ISSN 0368-1769.