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Lanthanum(III) sulfate

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Lanthanum(III) sulfate
Names
Other names Lanthanum sulfate
Identifiers
CAS Number	10099-60-2^Y
3D model (JSmol)	Interactive image
ChemSpider	140072
ECHA InfoCard	100.030.204
EC Number	233-239-6
PubChem CID	159259
UNII	4636PY459O
UN number	4636PY459O
CompTox Dashboard(EPA)	DTXSID00890640
InChI Key: VQEHIYWBGOJJDM-UHFFFAOYSA-H InChI=1S/2La.3H2O4S/c;;31-5(2,3)4/h;;3(H2,1,2,3,4)/q2*+3;;;/p-6
SMILES [O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[La+3].[La+3]
Properties
Chemical formula	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)
Solubility in water	2.7 g/100 mL (20 °C, nonahydrate)^[1]
Solubility	insoluble inethanol^[1]
Structure^[3]
Crystal structure	hexagonal
Space group	P6₃
Lattice constant	a = 11.01 Å,c = 8.08 Å
Hazards
GHS labelling:[1]
Pictograms
Signal word	Warning
Hazard statements	H315,H319,H335
Precautionary statements	P261,P264,P264+P265,P271,P280,P302+P352,P304+P340,P305+P351+P338,P319,P321,P332+P317,P337+P317,P362+P364,P403+P233,P405,P501
NFPA 704 (fire diamond)	0 0 1
Related compounds
Otheranions	Lanthanum(III) nitrate
Othercations	Cerium(III) sulfate
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). Infobox references

Chemical compound

Lanthanum(III) sulfate is aninorganic 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 producinglanthanum from its ores.^[4]

Preparation and reactions

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The nonahydrate is produced by dissolvinglanthanum orlanthanum hydroxide in dilutesulfuric acid, then evaporating the solution:^[5]

2 La + 3 H₂SO₄ → La₂(SO₄)₃ + 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 tolanthanum(III) oxide at 1100 °C.^[2]

Structure

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The nonahydrate crystallizes in a hexagonal crystal system, which contains the lanthanum atoms in two different environments.^[3]

References

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^^a ^b ^cHaynes, William, ed. (2016).CRC Handbook of Chemistry and Physics (93rd ed.). CRC Press. p. 4-70.ISBN 9781439880500.
^^a ^bJames 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.Bibcode:2003ApSS..214...83P.doi:10.1016/S0169-4332(03)00358-1.
^^a ^bElizabeth 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.

v t e Lanthanum compounds
La(CH ₃COO) ₃ La(C₅H₇O₂)₃ LaAlO₃ LaB₆ LBCO LaBr₃ LaC₂ LaCl₃ La₂(CO₃)₃ LaCoO₃ C ₃₆H ₇₂LaO ₆ LaF₃ LaH₁₀ La₂Hf₂O₇ La(IO₃)₃ LaI₃ LaN LaMnO₃ LaNi_x (LaNi₅) La(NO₃)₃ La₂(SO₄)₃ La ₂(C ₂O ₄) ₃ La₂O₃ LaOF La ₂O ₂S La(OH)₃ LaP La₂Te₃ LaYbO₃ LLZO LSAT LSCF LSM C ₅₄H ₁₀₅LaO ₆ LaS La₂S₃

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