Alum

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• Molecular formula: H₂₄AlKO₂₀S₂
• Molar mass: 477.412
• CAS Registry Number: Not available
• Appearance: Aluminum potassium sulfate dodecahydrate, ACS, 98.0-102.0%; Aluminum potassium sulfate dodecahydrate, ACS, 98.0-102.0%; white to colourless crystals
• Melting point: 93 °C
• Boiling point: Not available
• Solubility: Soluble in water, glycerol. Insoluble in alcohol
• Safety sheet: Not available
• Spectra: Check on SDBS. Add Spectra (Help).

• From Wikipedia

  Alum is both a specific chemical compound and a class of chemical compounds. The specific compound is the hydrated potassiumaluminium sulfate (potassium alum) with the formula KAl(link=sulfateSO4)₂·12link=waterH2O. More widely, alums are double sulfate salts, with the general formula AM(SO4)2·12H2O, where A is a monovalent cation such as potassium or ammonium and M is a trivalent metal ion such as aluminium or chromium(III). When the trivalent ion is aluminium, the alum is named after the monovalent ion.

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  Other names

  Aluminium potassium sulfate hydrate (1:1:2:12) (IUPAC Name); Dodecahydrate potassium alum; aluminium potassium sulfate 12-hydrate; Aluminium potassium sulfate dodecahydrate; aluminium potassium sulphate 12-hydrate; Aluminum potassium disulfate dodecahydrate; aluminum potassium sulfate 12-hydrate; Aluminum potassium sulfate dodecahydrate; Kalinite; Potash alum; Potash alum dodecahydrate; Potassium alum; Potassium alum dodecahydrate; Potassium aluminum disulfate dodecahydrate; Potassium aluminum sulfate dodecahydrate