Aluminium Sulfate Octahydrate Al2SO43 - 500g

Aluminium Sulfate Octahydrate
Other Names: Aluminium sulphate, Dialuminium trisulfate, Cake alum

CAS Number: 10043-01-3
EC Number: 233-135-0
Chemical Formula: Al₂(SO₄)₃·8H₂O
Molar Mass: 666.42 g/mol
Appearance: White to off-white crystalline solid

Aluminium sulfate octahydrate is an inorganic salt composed of aluminium, sulfur, and oxygen, typically used as a coagulating agent. It is commonly applied in water treatment, paper production, and as a mordant in dyeing processes. The octahydrate form contains eight molecules of water of crystallization, making it stable under normal storage conditions.

Chemical and Physical Properties

• Density: ~1.61 g/cm³

• Melting Point: Decomposes before melting

• Solubility in Water: Highly soluble (at ~31.2 g/100 mL at 20°C)

• Solubility in Other Solvents: Insoluble in alcohol and organic solvents

• Odor: Odorless

Applications

• Water and Wastewater Treatment: Used to remove suspended solids and control water pH by coagulation.

• Pulp and Paper Industry: Aids in paper sizing to improve ink absorbency.

• Textile Industry: Employed as a mordant in dyeing processes.

• Construction: Occasionally used in waterproofing and accelerating concrete setting.

• Analytical Chemistry: Applied in laboratory tests as a source of aluminium ions.

Safety

Signal Word: Warning

Handling and Storage
Store in a cool, dry, and well-ventilated area in a tightly sealed container. Protect from moisture. Avoid contact with strong acids and bases. Use appropriate personal protective equipment when handling.