Ammonium Iron (III) Oxalate Trihydrate ≥99%, Pure, Approx 13% Fe

What is Ammonium Iron(III) Oxalate?

Ammonium trioxalatoferrate (III) is a complex of trivalent iron with oxalate anions as ligands and ammonium ions for charge compensation. As a trihydrate, it has the semi-structural formula (NH4)3[Fe(C2O4)3] · 3 H2O. The CAS number is 13268-42-3

Ammonium Iron(III) oxalate is a green crystalline compound that is easily soluble in water.

The Fe3+ ion is complexed octahedrally by three oxalate ions. The resulting charge of -3 on the complex is balanced by three ammonium ions.

What is ammonium Iron(III) oxalate used for?

It is used in anodizing, the surface treatment of aluminum, to create a gold hue.

Exposure to light leads to decomposition producing carbon dioxide and iron(II) compounds. This property allows it to be used to measure light. In artistic photography, it is part of the solution for creating cyanotypes.

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Technical data:

Ammonium ferric oxalate, Iron ammonium oxalate

Empirical formula (NH4)3Fe(C2O4)3 3 H2O
Molar mass (M) 428.06 g/mol
Density 1.78
Melting point (mp)160-170 °C (Dec)
Solubility: 1000 g/l (H2O, 20 °C)
WCK 1
CAS No.[13268-42-3]
EC-No. 220-952-2

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Hazard Statements
H302+H312 Harmful if swallowed or in contact with skin
Safety Recommendations

Precautions - prevention
P270 Do not eat, drink or smoke when using this product.
P280 Wear protective gloves/eye protection.

Precautions - response
P302+P352 IF ON SKIN: Wash with plenty of water.