Lanthanum(III) sulfate
Appearance
Names | |
---|---|
Other names
| |
Identifiers | |
3D model (JSmol)
|
|
ChemSpider | |
ECHA InfoCard | 100.030.204 |
EC Number |
|
PubChem CID
|
|
UN number | 4636PY459O |
CompTox Dashboard (EPA)
|
|
| |
| |
Properties | |
La2(SO4)3 | |
Molar mass | 566.00 g/mol |
Appearance | White solid[1] |
Density | 2.82 g/cm3 (nonahydrate) |
Melting point | 775 °C (1,427 °F; 1,048 K)[2] (decomposition) |
2.7 g/100 mL (20 °C, nonahydrate)[1] | |
Solubility | insoluble in ethanol[1] |
Structure[3] | |
hexagonal | |
P63 | |
a = 11.01 Å, c = 8.08 Å
| |
Hazards | |
NFPA 704 (fire diamond) | |
Related compounds | |
Other anions
|
Lanthanum(III) nitrate |
Other cations
|
Cerium(III) sulfate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|
Lanthanum(III) sulfate is an inorganic compound with the formula La2(SO4)3·xH2O (0 ≥ x ≥ 9). It forms various hydrates, the most common one being the nonahydrate, which are all white solids. It is an intermediate in producing lanthanum from its ores.[4]
Preparation and reactions
[edit]The nonahydrate is produced by dissolving lanthanum or lanthanum hydroxide in dilute sulfuric acid, then evaporating the solution:[5]
- La + H2SO2 → La2(SO4)3 + H2
The anhydrous compound can be produced by heating the hydrates to 300 °C. If heated further, anhydrous lanthanum(III) sulfate decomposes to La2O2SO4 at 775 °C, which in turn decomposes to lanthanum(III) oxide at 1100 °C.[2]
Structure
[edit]The nonahydrate crystallizes in a hexagonal crystal system, which contains the lanthanum atoms in two different environments.[3]
References
[edit]- ^ a b c Haynes, William, ed. (2016). CRC Handbook of Chemistry and Physics (93rd ed.). CRC Press. p. 4-70. ISBN 9781439880500.
- ^ a b James A. Poston Jr.; Ranjani V. Siriwardane; Edward P. Fisher; Angela L. Miltz (2003). "Thermal decomposition of the rare earth sulfates of cerium(III), cerium(IV), lanthanum(III) and samarium(III)". Applied Surface Science. 214 (1–4): 83–102. doi:10.1016/S0169-4332(03)00358-1.
- ^ a b Elizabeth Gebert Sherry (1976). "The structure of Pr2(SO4)3 · 8H2O and La2(SO4)3 · 9H2O". Journal of Solid State Chemistry. 19 (3): 271–279. doi:10.1016/0022-4596(76)90177-8.
- ^ Greenwood & Earnshaw (1984), pp. 1426–1429
- ^ Richard A. Vanderpool; Masood A. Khan; Roger Frech (1991). "Structure and Raman spectra of single crystal La2(SO4)3 · 8H2O". Journal of Molecular Structure. 245 (3–4): 255–273. doi:10.1016/0022-2860(91)87101-M.
Bibliography
[edit]- Greenwood, Norman N.; Earnshaw, Alan (1984). Chemistry of the Elements. Oxford: Pergamon Press. ISBN 978-0-08-022057-4.