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Merck
CN

402818

Sigma-Aldrich

Ammonium aluminum sulfate dodecahydrate

ACS reagent, ≥98%

Synonym(s):

Aluminum ammonium sulfate dodecahydrate, Ammonium alum

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About This Item

Linear Formula:
AlNH4(SO4)2 · 12H2O
CAS Number:
7784-26-1
Molecular Weight:
453.33
EC Number:
232-055-3
MDL number:
MFCD00149958
UNSPSC Code:
12352300
PubChem Substance ID:
329755965
NACRES:
NB.24

Key Documents

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grade

ACS reagent

Assay

≥98%
98.0-102.0% (ACS specification)

impurities

≤0.005% insolubles

mp

93.5 °C (lit.)

anion traces

chloride (Cl-): ≤0.001%

cation traces

Ca: ≤0.05%
Fe: ≤0.001%
K: ≤0.05%
Na: ≤0.01%
heavy metals (as Pb): ≤0.001%

SMILES string

[Al+3].[H]O[H].[H]O[H].[H]O[H].[H]O[H].[H]O[H].[H]O[H].[H]O[H].[H]O[H].[H]O[H].[H]O[H].[H]O[H].[H]O[H].[H][N+]([H])([H])[H].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O

InChI

1S/Al.H3N.2H2O4S.12H2O/c;;2*1-5(2,3)4;;;;;;;;;;;;/h;1H3;2*(H2,1,2,3,4);12*1H2/q+3;;;;;;;;;;;;;;;/p-3

InChI key

WZUKKIPWIPZMAS-UHFFFAOYSA-K

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General description

Ammonium aluminum sulfate dodecahydrate commonly called as ammonium alum is widely used in water purification, cosmetic formulation, fertilizers and food preservation. Its thermal decomposition has been studied. It has high latent heat of 251 kJ kg-1 with a potential use in the heating system. Its utility as a flame-retardant for cotton fabric has been analyzed.

Application

Ammonium aluminum sulfate dodecahydratemay be used in the preparation of Alum (Al(OH)3) gel.

Storage Class Code

11 - Combustible Solids

WGK

WGK 2

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Certificates of Analysis (COA)

Lot/Batch Number
MKCM5293
MKBZ8506V
MKBZ5340V
MKBW4448V
MKBS3589V

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Thermogravimetry of deposited ammonium aluminum sulfate dodecahydrate used as flame-retardant for cotton fabrics.
Mostashari SM and Mostashari SZ.
Cellulose Chemistry and Technology, 43(9), 455-455 (2009)
Thermal characterization of ammonium alum.
Lopez-Beceiro J, et al.
Journal of Thermal Analysis and Calorimetry, 104(1), 127-130 (2010)
Flow and heat transfer characteristics of ammonium alum hydrate slurries.
Suzuki H, et al.
International Journal of Refrigeration, 36(1), 81-87 (2013)
Preventive and curative glycoside kaempferol treatments attenuate the TH2-driven allergic airway disease.
Medeiros KCP, et al.
International Immunopharmacology, 9(13), 1540-1548 (2009)
David A Stevens et al.
Chemical senses, 33(5), 405-413 (2008-03-05)
Three multidimensional scaling studies were conducted to compare the taste qualities evoked from electrical and chemical stimulation, including ferrous sulfate as a typical "metallic" taste stimulus. Bipolar, anodal, and cathodal stimulation were delivered by 1.5- or 3-V batteries applied to
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