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Merck
CN

402818

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
NACRES:
NB.24
PubChem Substance ID:
329755965
UNSPSC Code:
12352300
EC Number:
232-055-3
MDL number:
MFCD00149958

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cation traces

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

InChI key

WZUKKIPWIPZMAS-UHFFFAOYSA-K

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

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

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%

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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

11 - Combustible Solids

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Certificates of Analysis (COA)

Lot/Batch Number
MKCM5293
MKBZ8506V
MKBZ5340V
MKBW4448V
MKBS3589V

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Flow and heat transfer characteristics of ammonium alum hydrate slurries.
Suzuki H, et al.
International Journal of Refrigeration, 36(1), 81-87 (2013)
Thermal characterization of ammonium alum.
Lopez-Beceiro J, et al.
Journal of Thermal Analysis and Calorimetry, 104(1), 127-130 (2010)
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)
Preventive and curative glycoside kaempferol treatments attenuate the TH2-driven allergic airway disease.
Medeiros KCP, et al.
International Immunopharmacology, 9(13), 1540-1548 (2009)
V Hostomská et al.
Journal of hazardous materials, 147(1-2), 342-349 (2007-02-20)
Experiments with cooling crystallization of ammonium alum, (NH(4)Al(SO(4))2.12H(2)O), were performed with concentrated multicomponent acidic solutions (originating from underground uranium leaching in Stráz pod Ralskem area, Czech Republic, and containing as the principal components Al3+, NH4+, and SO4(2-) ions) as well
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