Chemical Formula of Aluminium Sulphate:
Aluminium sulphate is represented by the chemical formula Al2(SO4)3.

Common Name:
The common name of aluminium sulphate is alum.

Explanation:
Aluminium sulphate, commonly known as alum, is a chemical compound made up of aluminium, sulfur, and oxygen. It is widely used in various industrial processes and products due to its versatile properties. Alum is a white, crystalline powder that is soluble in water and has a slightly sweet taste.

Aluminium sulphate is commonly used in water treatment plants as a coagulating agent to remove impurities from water. It helps in the removal of suspended particles, organic matter, and bacteria, making the water safe for consumption. Additionally, alum is used in the manufacturing of paper, textiles, and dyes.

In the cosmetic industry, aluminium sulphate is used in the production of deodorants and antiperspirants due to its ability to reduce sweat production. It is also used in the tanning process of leather to improve its quality and texture.

Overall, aluminium sulphate, or alum, plays a crucial role in various industries and applications due to its effective coagulating, astringent, and antimicrobial properties.