Ammonium iron(III) sulfate
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Names | |
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IUPAC name
Ammonium iron(III) sulfate | |
Other names
Ferric ammonium sulfate Ferric alum | |
Identifiers | |
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3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.030.335 |
EC Number |
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PubChem CID |
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UNII |
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CompTox Dashboard (EPA) |
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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) | |
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).
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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.[2] 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,[3] and others claiming it to be a property of the crystal itself.[4]
FAS is paramagnetic,[5] acidic and toxic towards microorganisms.[6] It is a weak oxidizing agent, capable of being reduced to Mohr's salt, ferrous ammonium sulfate.