Lanthanum oxalate

Lanthanum oxalate is an inorganic compound, a salt of lanthanum metal and oxalic acid with the chemical formula La
₂(C
₂O
₄)
₃.^[1][2]

Lanthanum oxalate

Names
Other names lanthanum(3+);oxalate, lanthanum sesquioxalate
Identifiers
CAS Number	537-03-1 Y
3D model (JSmol)	Interactive image
ChemSpider	144342
ECHA InfoCard	100.007.871
EC Number	208-656-1
PubChem CID	164654
CompTox Dashboard (EPA)	30927256
InChI InChI=1S/3C2H2O4.2La/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6 Key: OXHNIMPTBAKYRS-UHFFFAOYSA-H
SMILES C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].[La+3].[La+3]
Properties
Chemical formula	C 6La 2O 12
Molar mass	541.87 g/mol
Appearance	colorless crystals
Density	g/cm3
Solubility in water	poorly soluble
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312, H317, H411
Precautionary statements	P261, P264, P270, P272, P273, P280, P301+P317, P302+P352, P317, P321, P330, P333+P317, P362+P364, P391, P501
Related compounds
Other cations	Cerium(III) oxalate Europium(III) oxalate Gadolinium(III) oxalate Holmium(III) oxalate Neodymium(III) oxalate Praseodymium(III) oxalate Promethium(III) oxalate Samarium(III) oxalate Terbium(III) oxalate Thulium(III) oxalate Ytterbium(III) oxalate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Reaction of soluble lanthanum nitrate with an excess of oxalic acid:

2 La(NO₃)₃ + 3 (COOH)₂ → La₂(C₂O₄)₃ + 6 HNO₃

Also, a reaction of lanthanum chloride with oxalic acid:

2 LaCl₃ + 3 H₂C₂O₄ → La₂(C₂O₄)₃ + 6 HCl

Physical properties

Lanthanum(III) oxalate forms colorless crystals that are poorly soluble in water.^[3]

The compound forms various crystallohydrates La
₂(C
₂O
₄)
₃•nH
₂O, where n = 1, 2, 3, 7, and 10.^[4][5]

The crystallohydrates decompose when heated.^[6]