Ammonium alum

Ammonium alum is a specific type of alum that is composed of ammonium (NH4+) and a trivalent metal ion, typically aluminium (Al3+). It is a class of chemical compounds that are both double salts and a type of salt in chemistry. Ammonium alum has the formula NH4Al(SO4)2·12H2O.

History

The use of ammonium alum dates back to ancient times, where it was used for a variety of purposes including water purification, in the tanning of hides, and in baking. It was also used in the dyeing process as a mordant, a substance that helps to fix dyes on fabrics.

Production

Ammonium alum is produced by combining ammonium sulfate and aluminum sulfate. In this process, the aluminum sulfate reacts with the ammonium sulfate to form a soluble alum.

Uses

Ammonium alum is used in a variety of applications. It is used in the water treatment industry as a coagulant, where it helps to remove suspended particles from water. It is also used in the textile industry as a mordant, and in the food industry as a food additive.

In the cosmetics industry, ammonium alum is used as an ingredient in some types of deodorant and as an astringent in skin care products. It is also used in fire extinguishers as a fire-retarding agent.

Safety

While ammonium alum is generally considered safe for use in many applications, it can be harmful if ingested in large amounts or if it comes into contact with the eyes. It is recommended to handle ammonium alum with care and to use appropriate safety equipment.

See also

• Alum
• Ammonium sulfate
• Aluminum sulfate