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Aluminum ammonium sulfate, also known as ammonium alum or just alum, is a chemical compound with the formula (NH4)Al(SO4)2·12H2O. It's a white crystalline solid commonly used in water purification, leather tanning, and as a mordant in dyeing textiles. In water purification, alum acts as a coagulant to remove impurities by causing suspended particles to clump together, making it easier for filtration to remove them. In leather tanning, it helps to stabilize the leather by tightening the collagen fibers. And in dyeing textiles, alum helps the dye adhere to the fabric. However, it's important to note that excessive exposure to aluminum compounds like alum can be harmful, so it's typically used with caution and proper safety measures.

  Aluminum sulfate, also known as alum, is a chemical compound with the formula Al2(SO4)3. It's commonly used in water treatment plants as a coagulant to clarify turbid or muddy water by causing suspended particles to clump together and settle out. In addition to water treatment, aluminum sulfate has various other industrial applications, such as in paper manufacturing, dyeing, and as a mordant in textile dyeing to help fix dyes to fabrics.

Ammonium chloride is an inorganic compound with the chemical formula NH4Cl. It is a white crystalline salt that is highly soluble in water and has a salty taste. Ammonium chloride is often used in various industrial and laboratory applications, including as a flux in soldering, as a nitrogen source in fertilizers, and as a component in dry cell batteries. It can also be used in medicine as an expectorant to help thin and loosen mucus in the respiratory system