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HomeProduct name listAluminium ammonium sulfate dodecahydrate

Aluminium ammonium sulfate dodecahydrate

Synonym(s):Alum ammonium, Ammonium alum;Aluminium ammonium sulfate dodecahydrate;Aluminum ammonium sulfate dodecahydrate;Ammonium alum

  • CAS NO.:7784-26-1
  • Empirical Formula: AlH28NO20S2
  • Molecular Weight: 453.33
  • MDL number: MFCD00149958
  • EINECS: 616-522-2
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2023-12-04 17:50:15
Aluminium ammonium sulfate dodecahydrate Structural

What is Aluminium ammonium sulfate dodecahydrate?

Chemical properties

Colorless transparent cube or white powder. No smell, astringent taste. Slightly soluble in water (15g/100ml at 20℃), easily soluble in hot water. The water solution is acidic. Soluble in dilute acid and glycerol, insoluble in alcohol. Loses 10 molecules of water when heated to 120℃, becomes anhydrous alum when heated to 200℃, and decomposes at 280℃.

The Uses of Aluminium ammonium sulfate dodecahydrate

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

What are the applications of Application

Ammonium aluminum sulfate dodecahydrate is a crystalline double sulfate

Definition

ChEBI: Ammonium alum is an inorganic sulfate salt.

Preparation

Aluminium ammonium sulfate dodecahydrate is produced through the reaction of sulphuric acid with aluminium hydroxide. Ammonium sulphate is added to the mixture and allowed to react. The mixture is then cooled and crystallized, followed by centrifugal separation. The resulting product is dried to obtain the final aluminium ammonium sulfate.

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.

Purification Methods

Crystallise it from hot H2O and cool in ice. When the melt is heated, it loses NH3 and H2SO4, and gives pure alumina at red heat. Solubility (%) in H2O is 3.9 (0o), 15.0 (20o) and 135 (100o).

Properties of Aluminium ammonium sulfate dodecahydrate

Melting point: 93.5 °C(lit.)
Boiling point: 200 °C
Density  1.64
storage temp.  Store at +5°C to +30°C.
solubility  H2O: 0.1 M at 20 °C, clear, colorless
form  Solid
color  White
Specific Gravity 1.64
PH Range 2.6
Odor Odorless
PH 2.6 (100g/l, H2O, 25℃)
Water Solubility  Soluble in water and glycerol. Insoluble in alcohol.
Merck  14,327
Exposure limits NIOSH: TWA 2 mg/m3
Stability: Stable.
CAS DataBase Reference 7784-26-1(CAS DataBase Reference)
EPA Substance Registry System Aluminum ammonium disulfate dodecahydrate (7784-26-1)

Safety information for Aluminium ammonium sulfate dodecahydrate

Signal word Warning
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H315:Skin corrosion/irritation
H319:Serious eye damage/eye irritation
H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes P261:Avoid breathing dust/fume/gas/mist/vapours/spray.
P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405:Store locked up.

Computed Descriptors for Aluminium ammonium sulfate dodecahydrate

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