Aluminum potassium sulfate dodecahydrate (KAl(SO4)2•12H2O)-Crystalline introduce:
Potassium alum, potash alum, or potassium aluminium sulfate is a chemical compound: the double sulfate of potassium and aluminium, with chemical formula KAl(SO4)2. It is commonly encountered as the dodecahydrate, KAl(SO4)2·12H2O. It crystallizes in cubic structure with space group P a -3 and lattice parameter of 12.18 Å. The compound is the most important member of the generic class of compounds called alums, and is often called simply alum.
Molar mass:258.192 g/mol (anhydrous);474.37 g/mol (dodecahydrate)
Melting point:92 to 95 °C (198 to 203 °F; 365 to 368 K)
Boiling point:200 °C (392 °F; 473 K)
Solubility in water:14.00 g/100 mL (20 °C);36.80 g/100 mL (50 °C)
Solubility in other solvents:Insoluble in acetone
Refractive index (nD):1.4564
Potassium alum is commonly used in water purification, leather tanning, dyeing, fireproof textiles, and baking powder as E number E522. It also has cosmetic uses as a deodorant, as an aftershave treatment and as a styptic for minor bleeding from shaving.
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