Praseodymium(III) sulfate
Chemical compound
From Wikipedia, the free encyclopedia
Praseodymium(III) sulfate is a praseodymium compound with formula Pr2(SO4)3. It is an odourless whitish-green crystalline salt. The anhydrous substance readily absorbs water forming pentahydrate and octahydrate.[1]
Praseodymium sulfate octahydrate | |
| Names | |
|---|---|
| IUPAC name
praseodymium(3+); trisulfate | |
| Other names
Praseodymium sulphate, dipraseodymium trisulphate, praseodymium(III) sulfate | |
| Identifiers | |
| |
3D model (JSmol) |
|
| ChemSpider | |
| ECHA InfoCard | 100.030.553 |
| EC Number |
|
PubChem CID |
|
CompTox Dashboard (EPA) |
|
| |
| |
| Properties | |
| Pr2(SO4)3 Pr2(SO4)3·nH2O, n=2,5,8 | |
| Molar mass | 570.0031 g/mol 714.12534 g/mol (octahydrate) |
| Appearance | green crystalline solid |
| Density | 3.72 g/cm3[1] |
| Melting point | 1,010 °C (1,850 °F; 1,280 K) (decomposes)[1] |
| 113.0 g/L (20 °C) 108.8 g/L (25 °C) | |
| +9660·10−6 cm3/mol | |
| Hazards | |
| GHS labelling:[2] | |
 | |
| Warning | |
| H315, H319, H335 | |
| P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501 | |
| Flash point | Non-flammable |
| Related compounds | |
Other anions |
Praseodymium carbonate Praseodymium chloride |
Other cations |
Neodymium sulfate |
Related compounds |
Praseodymium(III) oxide Praseodymium(III) sulfide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
Properties
Praseodymium sulfate is stable under standard conditions. At elevated temperatures, it gradually loses water and becomes more whitish. Like all rare earth sulfates, its solubility decreases with temperature, a property once used to separate it from other, non-rare earth compounds.
Pentahydrate and octahydrate have monoclinic crystal structures with densities of 3.713 and 2.813 g/cm3, respectively. The octahydrate crystals are optically biaxial, with refractive index components of nα = 1.5399, nβ = 1.5494 and nγ = 1.5607.[1] They belong to the space group C12/c1 (No. 15) and have lattice constants a = 1370.0(2) pm, b = 686.1(1) pm, c = 1845.3(2) pm, β = 102.80(1)° and Z = 4.[3]
Synthesis
Crystals of octahydrate can be grown from solution obtained by dissolving wet Pr2O3 powder with sulfuric acid. This procedure can be optimised by adding a few evaporation/dissolution steps involving organic chemicals.[3]