Iron(II) oxalate

Iron(II) oxalate

200px
200px
Names
IUPAC name Iron(II) oxalate
Other names Iron oxalate Ferrous oxalate
Identifiers
CAS Number	516-03-0 N 6047-25-2 (dihydrate) N
EC Number	208-217-4
Jmol 3D model	Interactive image
PubChem	10589
InChI InChI=1S/3C2H2O4.2Fe/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6 N Key: VEPSWGHMGZQCIN-UHFFFAOYSA-H N
SMILES [Fe+3].[Fe+3].O=C([O-])C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O
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	190 °C (374 °F; 463 K) (anhydrous) 150–160 °C (302–320 °F; 423–433 K) (dihydrate) decomposes
Boiling point	365.1 °C (689.2 °F; 638.2 K) (anhydrous)
Solubility in water	dihydrate: 0.097 g/100ml (25 °C)
Vapor pressure	{{{value}}}
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

Ferrous oxalate, or iron(II) oxalate, is a chemical compound consisting of one iron(II) ion (Fe²⁺) and one oxalate ion (C₂O₄²⁻). It has the chemical formula FeC₂O₄.

Iron(II) oxalate is more commonly encountered as the dihydrate, FeC₂O₄·2H₂O, CAS # 6047-25-2. Its crystal structure consists of chains of oxalate-bridged iron atoms, capped by water molecules.
Ball-and-stick model of a chain in the crystal structure of iron(II) oxalate dihydrate

When heated, it dehydrates and decomposes into carbon dioxide, carbon monoxide, iron oxides and pyrophoric black iron.

Safety

Iron(II) oxalate is harmful when swallowed. It may cause irritation to eyes and skin.

See also

A number of other iron oxalates are known

• Iron(III) oxalate
• Potassium ferrioxalate
• Sodium ferrioxalate