Iron(III) chromate

Iron(III) chromate^[1]
Names
	IUPAC name iron(III) chromate
Identifiers
CAS Number	10294-52-7 ;
3D model (JSmol)	Interactive image;
ChemSpider	10653099;
ECHA InfoCard	100.030.588
EC Number	233-661-0;
PubChem CID	21902690;
UNII	O2123EJH4E ;
CompTox Dashboard (EPA)	DTXSID101045361 ;
	InChI InChI=1S/3Cr.2Fe.12O/q;;;2+3;;;;;;;6-1 Key: OXLBLZDGMWMXSM-UHFFFAOYSA-N;
	SMILES [O-][Cr](=O)(=O)[O-].[O-][Cr](=O)(=O)[O-].[O-][Cr](=O)(=O)[O-].[Fe+3].[Fe+3];
Properties
Chemical formula	Fe2(CrO4)3
Molar mass	459.6808 g/mol
Appearance	yellow powder
Solubility in water	reacts, see also solubility chart
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	toxic (contain Cr(VI))
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H317, H331, H350, H373
Precautionary statements	P203, P260, P264, P270, P271, P272, P280, P301+P317, P302+P352, P304+P340, P316, P318, P319, P321, P330, P333+P317, P362+P364, P403+P233, P405, P501
	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

Iron(III) chromate is the iron(III) salt of chromic acid with the chemical formula Fe₂(CrO₄)₃.

Discovery

Iron(III) chromate was discovered by Samuel Hibbert-Ware in 1817 while visiting Shetland.^[3]

It may be formed by the salt metathesis reaction of potassium chromate and iron(III) nitrate, which gives potassium nitrate as byproduct.

2 Fe(NO₃)₃ + 3 K₂CrO₄ → Fe₂(CrO₄)3 + 6 KNO₃

It also can be formed by the oxidation by air of iron and chromium oxides in a basic environment:

4 Fe₂O₃ + 6 Cr₂O₃ + 9 O₂ → 4 Fe₂(CrO₄)₃

↑ Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 4–63. ISBN 0-8493-0594-2.
↑ PubChem. "Ferric chromate(VI)". pubchem.ncbi.nlm.nih.gov. Retrieved 2026-02-11.
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