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CAS 10043-67-1

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Potassium alum

Description:
Potassium alum, also known as potassium aluminum sulfate, is a chemical compound with the formula KAl(SO₄)₂·12H₂O. It is a colorless, crystalline solid that is highly soluble in water, forming a clear solution. This compound is commonly found in nature as the mineral kalinite and is widely used in various applications, including water purification, food processing, and as a mordant in dyeing. Potassium alum exhibits astringent properties and is often utilized in cosmetics and personal care products. It has a relatively low toxicity, making it safe for use in food and pharmaceuticals when used appropriately. The compound crystallizes in the orthorhombic system and has a characteristic sweetish taste. In addition to its practical uses, potassium alum plays a role in various chemical reactions, particularly in the formation of aluminum hydroxide when reacted with bases. Its ability to act as a flocculant makes it valuable in the treatment of drinking water and wastewater.
Formula:Al·2H2O4S·K
InChI:InChI=1S/Al.K.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)
InChI key:InChIKey=VWRKUHIZDIMTAF-UHFFFAOYSA-N
SMILES:S(=O)(=O)(O)O.[Al].[K]
Synonyms:
  • Aluminum potassium sulfate
  • Potassium aluminium sulfate,anhydrous
  • Alum potassium
  • Aluminum potassium sulfate (AlK(SO4)2)
  • Alum, potassium
  • dialuminum dipotassium sulfate
  • Burnt alum
  • Sulfuric acid, aluminum potassium salt (2:1:1)
  • Aluminium potassium sulphate
  • Potassium alum
  • aluminum potassium sulfate (1:1:2)
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