Iron(II) phosphate

Iron(II) phosphate, also ferrous phosphate,^[3] Fe₃(PO₄)₂, is an iron salt of phosphoric acid.

Iron(II) phosphate

Names
IUPAC name Iron(II) phosphate
Other names Ferrous phosphate
Identifiers
CAS Number	14940-41-1 Y
3D model (JSmol)	Interactive image
ChemSpider	8039263 Y
ECHA InfoCard	100.035.456
EC Number	239-018-0
PubChem CID	9863567
UNII	D07L04MRWI Y
CompTox Dashboard (EPA)	DTXSID20872569
InChI InChI=1S/3Fe.2H3O4P/c;;;2*1-5(2,3)4/h;;;2*(H3,1,2,3,4)/q3*+2;;/p-6 Y Key: SDEKDNPYZOERBP-UHFFFAOYSA-H Y
SMILES [O-]P(=O)([O-])[O-].[O-]P(=O)([O-])[O-].[Fe+2].[Fe+2].[Fe+2]
Properties
Chemical formula	Fe3(PO4)2
Appearance	brown powder
Density	2.61 g/cm3 (octahydrate)
Melting point	180 °C (356 °F; 453 K) (octahydrate) decomposes[1]
Solubility in water	insoluble
Structure
Crystal structure	monoclinic (octahydrate)
Space group	C 2/m
Lattice constant	a = 10.086 (octahydrate), b = 13.441 (octahydrate), c = 4.703 (octahydrate) α = 90°, β = 104.27°, γ = 90°
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P280, P304+P340, P305+P351+P338, P405, P501
NFPA 704 (fire diamond)	[2] 2 1 0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Natural occurrences

The mineral vivianite is a naturally occurring form of hydrated iron(II) phosphate.

Production

It can be formed by the reaction of ferrous hydroxide with phosphoric acid to produce hydrated iron(II) phosphate.

See also

• Iron(III) phosphate