Ammonium iron(II) sulfate

Ammonium iron(II) sulfate
Names
	IUPAC name Ammonium iron(II) sulfate
	Other names Ferrous ammonium sulfate; Ammonium iron sulfate; Mohr's salt
Identifiers
CAS Number	anhydrous: 10045-89-3 ; hexahydrate: 7783-85-9;
3D model (JSmol)	Interactive image;
ChEBI	anhydrous: CHEBI:76243; hexahydrate: CHEBI:76181 ;
ChemSpider	anhydrous: 23246 ; hexahydrate: 13084980 ;
ECHA InfoCard	100.030.125
EC Number	233-151-8;
PubChem CID	anhydrous: 24863; hexahydrate: 15942308;
UNII	anhydrous: 9Q764AYJ9G ; hexahydrate: 99A04ICQ3J;
CompTox Dashboard (EPA)	DTXSID4041028 ;
	InChI InChI=1S/Fe.2H3N.2H2O4S/c;;;21-5(2,3)4/h;21H3;2(H2,1,2,3,4)/q+2;;;;/p-2 Key: IMBKASBLAKCLEM-UHFFFAOYSA-L ; InChI=1/Fe.2H3N.2H2O4S/c;;;21-5(2,3)4/h;21H3;2(H2,1,2,3,4)/q+2;;;;/p-2 Key: IMBKASBLAKCLEM-NUQVWONBAX;
	SMILES [Fe+2].[O-]S(=O)(=O)[O-].[O-]S([O-])(=O)=O.[NH4+].[NH4+];
Properties
Chemical formula	Fe(SO4)(NH4)2(SO4) (anhydrous); Fe(SO4)(NH4)2(SO4)·6H2O (hexahydrate)
Molar mass	284.05 g mol−1 (anhydrous); 392.14 g mol−1 (hexahydrate)
Appearance	Blue-green solid
Density	1.86 g/cm3
Melting point	100 to 110 °C (212 to 230 °F; 373 to 383 K)
Boiling point	Not applicable
Solubility in water	269 g/L (hexahydrate)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
NFPA 704 (fire diamond)	2 0 0
Safety data sheet (SDS)	Fisher MSDS
Related compounds
Related compounds	Ammonium iron(III) sulfate
	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

Ammonium iron(II) sulfate, or Mohr's salt, is the inorganic compound with the formula (NH₄)₂Fe(SO₄)₂(H₂O)₆. Containing two different cations, Fe²⁺ and NH+4, it is classified as a double salt of ferrous sulfate and ammonium sulfate. It is a common laboratory reagent because it is readily crystallized, and crystals resist oxidation by air. Like the other ferrous sulfate salts, ferrous ammonium sulfate dissolves in water to give the aquo complex [Fe(H₂O)₆]²⁺, which has octahedral molecular geometry. Its mineral form is mohrite.

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