Molecular formula: Al2(SO4)3

Molar mass:342.15 g/mol (anhydrous)

666.42 g/mol (octadecahydrate)

Density:2.672 g/cm3 (anhydrous)

1.62 g/cm3 (octadecahydrate)

Melting point:770 °C (decomp, anhydrous)

86.5 °C (octadecahydrate)

Solubility in water:31.2 g/100 mL (0 °C)

36.4 g/100 mL (20 °C)

89.0 g/100 mL (100 °C)

Solubility:slightly soluble in alcohol, dilute mineral acids

Appearance:white crystalline solid hygroscopic

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Aluminium sulfate is a widely used industrial chemical. It is sometimes incorrectly referred to as alum, as it is closely related to this group of compounds. It occurs naturally as the mineral alunogenite. It is frequently used as a flocculating agent in the purification of drinking water and waste water treatment plants, and also in paper manufacturing.