402818

Ammonium aluminum sulfate dodecahydrate

ACS reagent, ≥98%

• Synonym(s): Aluminum ammonium sulfate dodecahydrate, Ammonium alum
• 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

Properties

• 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

Description

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.[1] It has high latent heat of 251 kJ kg^-1 with a potential use in the heating system.[2] Its utility as a flame-retardant for cotton fabric has been analyzed.[3]

Application

Ammonium aluminum sulfate dodecahydratemay be used in the preparation of Alum (Al(OH)₃) gel.[4]

Safety Information

• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 2