A2140

Ammonium aluminum sulfate dodecahydrate

ReagentPlus^®, ≥99% (titration)

• 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: 12352302
• PubChem Substance ID: 329770770
• NACRES: NA.55
• assay: ≥99% (titration)
• form: powder or crystals

Properties

• Quality Level: 100
• product line: ReagentPlus^®
• assay: ≥99% (titration)
• form: powder or crystals
• pH: 2.6 (25 °C, 100 g/L)
• mp: 93.5 °C (lit.)
• 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 the water purification, cosmetic formulation, fertilizers and food preservation. Its thermal decomposition has been studied. It has high latent heat of 251kJkg^-1 with a potential use in the heating system. Its utility as a flame-retardant for cotton fabric has been studied.

Application

Ammonium aluminum sulfate dodecahydrate may be used in the preparation of alum (Al(OH)₃) gel and monodispersed yttrium aluminum garnet (YAG) powder.

Legal Information

ReagentPlus is a registered trademark of Merck KGaA, Darmstadt, Germany

Safety Information

• Storage Class: 13 - Non Combustible Solids
• wgk_germany: WGK 2