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203505

Sigma-Aldrich

Ammonium iron(II) sulfate hexahydrate

99.997% trace metals basis

Synonym(s):
Ammonium ferrous sulfate hexahydrate, Ammonium iron(II) sulfate, Mohr’s salt
Linear Formula:
(NH4)2Fe(SO4)2 · 6H2O
CAS Number:
Molecular Weight:
392.14
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.23

Quality Level

Assay

99.997% trace metals basis

form

crystalline

impurities

≤35.0 ppm Trace Metal Analysis

mp

100 °C (dec.) (lit.)

SMILES string

N.N.O.O.O.O.O.O.[Fe++].OS([O-])(=O)=O.OS([O-])(=O)=O

InChI

1S/Fe.2H3N.2H2O4S.6H2O/c;;;2*1-5(2,3)4;;;;;;/h;2*1H3;2*(H2,1,2,3,4);6*1H2/q+2;;;;;;;;;;/p-2

InChI key

MQLVWQSVRZVNIP-UHFFFAOYSA-L

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This Item
1.93241215406F1543
assay

99.997% trace metals basis

assay

-

assay

98.5-101.5%, 99%

assay

≥98%

form

crystalline

form

-

form

powder or crystals

form

-

impurities

≤35.0 ppm Trace Metal Analysis

impurities

-

impurities

≤0.01% insolubles, ≤0.05% Not NH4OH pptd.

impurities

≤0.0005% Phosphorus (P), ≤0.01% Insoluble matter

mp

100 °C (dec.) (lit.)

mp

-

mp

100 °C (dec.) (lit.)

mp

100 °C (dec.) (lit.)

Quality Level

200

Quality Level

-

Quality Level

200

Quality Level

200

General description

Ammonium iron(II) sulfate is a light green to bluecrystalline powder, which dissolves readily in water, but is insoluble inethanol and acetone. The salt melts and begins to decompose at 100 °C.Ammonium iron(II) sulfate is a double salt of iron sulfateand ammonium sulfate and is made by dissolving equimolar iron(II) sulfate andammonium sulfate in water and crystallizing the product.

Application

Ammonium iron(II) sulfate is widely used as a source of Fe2+ ions because of its high solubility in water and because it oxidizes much more slowly in air than other ferrous salts like iron(II) sulfate. Consequently, the reagent finds broad applications from analytical titrations to aqueous redox chemistry as a reducing agent. Researchers often use ammonium iron(II) sulfate as a source of Fe2+ to synthesize iron-containing nanoparticles. For example, to synthesize magnetite (Fe3O4) nanoparticles, researchers co-precipitate aqueous solutions of ammonium iron(II) sulfate with a source of Fe3+, like FeCl3 or NH4Fe(SO4)2 . Ammonium iron(II) sulfate also serves as a precursor in the synthesis of iron(III) oxide-hydroxide (FeOOH) nanosheets and as reagents to dope metal oxide-hydroxide nanosheets with iron. Ammonium iron(II) sulfate is also well-suited to make olivine LiFePO4 by the co-precipitation method. In this method, aqueous solutions of ammonium iron(II) sulfate are mixed with ammonium phosphate and co-precipitated with lithium hydroxide. One advantage of this synthetic strategy is that it enables the in-situ formation of nanocomposites like LiFePO4/graphene.

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

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Certificate of Origin

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