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
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.030.125 Edit this at Wikidata
EC Number
  • 233-151-8
UNII
  • InChI=1S/Fe.2H3N.2H2O4S/c;;;2*1-5(2,3)4/h;2*1H3;2*(H2,1,2,3,4)/q+2;;;;/p-2 checkY
    Key: IMBKASBLAKCLEM-UHFFFAOYSA-L checkY
  • InChI=1/Fe.2H3N.2H2O4S/c;;;2*1-5(2,3)4/h;2*1H3;2*(H2,1,2,3,4)/q+2;;;;/p-2
    Key: IMBKASBLAKCLEM-NUQVWONBAX
  • [Fe+2].[O-]S(=O)(=O)[O-].[O-]S([O-])(=O)=O.[NH4+].[NH4+]
Properties
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
269 g/L (hexahydrate)
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H315, H319, H335
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)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
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).
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Ammonium iron(II) sulfate, or Mohr's salt, is the inorganic compound with the formula (NH4)2SO4.Fe(SO4).6H2O. 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.[1] Its mineral form is mohrite.

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