ammonia alum的意思|示意

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Ammonia alum and alum are two different substances.

Ammonia alum, or ammonium alum, is a type of alum that contains ammonium ions in addition to the usual aluminum ion found in other alums. Its chemical formula is (NH4)Al(SO4)2·12H2O, and it is composed of ammonium, aluminum, sulfur, and oxygen. It is usually white, odorless, and has a specific gravity of 1.44 to 1.53. Ammonia alum is mainly used in tanning and dyeing, fireproofing, water purification, and medicine. It is also used as an emulsifier, purifying agent, and preservative in food production.

Alum is a chemical compound that contains two elements, aluminum and sulfur. Its chemical formula is KAl(SO4)2·12H2O. It is usually white, odorless, and has a specific gravity of 1.8. Alum is usually found in the form of crystals, which have a very sharp taste. It is mainly used in tanning and dyeing, fireproofing, water purification, and medicinal purposes. In addition, alum is also widely used as a food preservative, an astringent, and for pickling and preserving fruits and vegetables.

In conclusion, ammonia alum and alum are both widely used in tanning and dyeing, fireproofing, water purification, and medicinal purposes, but they have different chemical formulas and different uses. Ammonia alum is mainly used in food production, while alum is mainly used in food preservation.