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Other names
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| Identifiers | |
| ECHA InfoCard | 100.030.204 
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| CompTox Dashboard (EPA) | |
| Properties | |
| Chemical formula | La2(SO4)3 |
| Molar mass | 566.00 g/mol |
| Appearance | White solid |
| Density | 2.82 g/cm (nonahydrate) |
| Melting point | 775 °C (1,427 °F; 1,048 K) (decomposition) |
| Solubility in water | 2.7 g/100 mL (20 °C, nonahydrate) |
| Solubility | insoluble in ethanol |
| Structure | |
| Crystal structure | hexagonal |
| Space group | P63 |
| Lattice constant | a = 11.01 Å, c = 8.08 Å |
| Hazards | |
| NFPA 704 (fire diamond) |
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| 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 , 100 kPa). Infobox references | |
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.
Preparation and reactions
The nonahydrate is produced by dissolving lanthanum or lanthanum hydroxide in dilute sulfuric acid, then evaporating the solution:
- 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.
Structure
The nonahydrate crystallizes in a hexagonal crystal system, which contains the lanthanum atoms in two different environments.
References
- ^ Haynes, William, ed. (2016). CRC Handbook of Chemistry and Physics (93rd ed.). CRC Press. p. 4-70. ISBN 9781439880500.
- ^ 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.
- ^ 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
- Greenwood, Norman N.; Earnshaw, Alan (1984). Chemistry of the Elements. Oxford: Pergamon Press. ISBN 978-0-08-022057-4.
| Lanthanum compounds | |
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