Iron(II) oxalate

Iron(II) oxalate
Names
	IUPAC name Iron(II) oxalate
	Other names Iron oxalate; Ferrous oxalate
Identifiers
CAS Number	(anhydrous): 516-03-0 ; (dihydrate): 6047-25-2 ;
3D model (JSmol)	(anhydrous): Interactive image; (dihydrate): Interactive image;
ChemSpider	(anhydrous): 10144; (dihydrate): 450862;
ECHA InfoCard	100.007.472
EC Number	(anhydrous): 208-217-4; (dihydrate): 611-981-5;
PubChem CID	(anhydrous): 10589; (dihydrate): 516788;
UNII	(anhydrous): DZP4YV3ICV ; (dihydrate): Z6X3YBU50D ;
CompTox Dashboard (EPA)	DTXSID4060159 ; (dihydrate): DTXSID90975879;
	InChI InChI=1S/3C2H2O4.2Fe/c33-1(4)2(5)6;;/h3(H,3,4)(H,5,6);;/q;;;2+3/p-6 Key: VEPSWGHMGZQCIN-UHFFFAOYSA-H ; (dihydrate): InChI=1S/C2H2O4.Fe.2H2O/c3-1(4)2(5)6;;;/h(H,3,4)(H,5,6);;21H2/q;+2;;/p-2 Key: NPLZZSLZTJVZSX-UHFFFAOYSA-L;
	SMILES (anhydrous): [Fe+2].O=C([O-])-C([O-])=O; (dihydrate): C(=O)(C(=O)[O-])[O-].O.O.[Fe+2];
Properties
Chemical formula	FeC2O4 (anhydrous); FeC2O4 · 2 H2O (dihydrate)
Molar mass	143.86 g/mol (anhydrous); 179.89 g/mol (dihydrate)
Appearance	yellow powder
Odor	odorless
Density	2.28 g/cm3
Melting point	dihydrate: 150–160 °C (302–320 °F; 423–433 K); (decomposes)
Solubility in water	dihydrate:; 0.097 g/100ml (25 °C)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312
Precautionary statements	P280
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Ferrous oxalate (iron(II) oxalate) refers to inorganic compounds with the formula FeC₂O₄(H₂O)_x where x is 0 or 2. These are yellow compounds. Characteristic of metal oxalate complexes, these compounds tend to be polymeric, hence their low solubility in water.

Names


IUPAC name Iron(II) oxalate
Other names Iron oxalate Ferrous oxalate
Identifiers
CAS Number	(anhydrous): 516-03-0^Y (dihydrate): 6047-25-2^Y
3D model (JSmol)	(anhydrous): Interactive image (dihydrate): Interactive image
ChemSpider	(anhydrous): 10144 (dihydrate): 450862
ECHA InfoCard	100.007.472
EC Number	(anhydrous): 208-217-4 (dihydrate): 611-981-5
PubChem CID	(anhydrous): 10589 (dihydrate): 516788
UNII	(anhydrous): DZP4YV3ICV^Y (dihydrate): Z6X3YBU50D^Y
CompTox Dashboard (EPA)	DTXSID4060159 (dihydrate): DTXSID90975879
InChI InChI=1S/3C2H2O4.2Fe/c33-1(4)2(5)6;;/h3(H,3,4)(H,5,6);;/q;;;2+3/p-6^N Key: VEPSWGHMGZQCIN-UHFFFAOYSA-H^N (dihydrate): InChI=1S/C2H2O4.Fe.2H2O/c3-1(4)2(5)6;;;/h(H,3,4)(H,5,6);;21H2/q;+2;;/p-2 Key: NPLZZSLZTJVZSX-UHFFFAOYSA-L
SMILES (anhydrous): [Fe+2].O=C([O-])-C([O-])=O (dihydrate): C(=O)(C(=O)[O-])[O-].O.O.[Fe+2]
Properties
Chemical formula	FeC₂O₄ (anhydrous) FeC₂O₄ · 2 H₂O (dihydrate)
Molar mass	143.86 g/mol (anhydrous) 179.89 g/mol (dihydrate)
Appearance	yellow powder
Odor	odorless
Density	2.28 g/cm³
Melting point	dihydrate: 150–160 °C (302–320 °F; 423–433 K) (decomposes)
Solubility in water	dihydrate: 0.097 g/100ml (25 °C)
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312
Precautionary statements	P280
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references