Ammonium iron(III) sulfate

Ammonium iron(III) sulfate
Names
IUPAC name
Ammonium iron(III) sulfate
Other names
Ferric ammonium sulfate
Ferric alum
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.335
EC Number
  • anhydride: 233-382-4
PubChem CID
UNII
  • InChI=1S/Fe.H3N.2H2O4S/c;;2*1-5(2,3)4/h;1H3;2*(H2,1,2,3,4)/q+3;;;/p-3 Y
    Key: XGGLLRJQCZROSE-UHFFFAOYSA-K Y
  • anhydride: InChI=1/Fe.H3N.2H2O4S/c;;2*1-5(2,3)4/h;1H3;2*(H2,1,2,3,4)/q+3;;;/p-3
    Key: XGGLLRJQCZROSE-DFZHHIFOAY
SMILES
  • anhydride: [Fe+3].[O-]S(=O)(=O)[O-].[O-]S([O-])(=O)=O.[NH4+]
Properties
FeNH4(SO4)2•12H2O
Molar mass 482.25 g/mol (dodecahydrate)
Appearance Pale violet octahedral crystals
Odor weak ammonia-like
Density 1.71 g/cm3
Melting point 39 to 41 °C (102 to 106 °F; 312 to 314 K)
1240 g/L
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Irritant
NFPA 704 (fire diamond)
1
0
0
Related compounds
Other anions
 Ammonium iron(III) citrate
Ammonium chloride
Other cations
 Ammonium aluminium sulfate
potassium aluminium sulfate
Related compounds
 Ammonium iron(II) sulfate
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

Ammonium iron(III) sulfate, NH4Fe(SO4)2·12 H2O, or NH4[Fe(H2O)6](SO4)2·6 H2O, also known as ferric ammonium sulfate (FAS) or iron alum, is a double salt in the class of alums, which consists of compounds with the general formula AB(SO4)2 · 12 H2O. It has the appearance of weakly violet, octahedrical crystals. There has been some discussion regarding the origin of the crystals' color, with some ascribing it to impurities in the compound, and others claiming it to be a property of the crystal itself.

FAS is paramagnetic, acidic and toxic towards microorganisms. It is a weak oxidizing agent, capable of being reduced to Mohr's salt, ferrous ammonium sulfate.

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