Aluminium Sulphate

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Aluminum Sulfate (Alum) is a white crystalline product which is almost insoluble in anhydrous alcohol, but readily soluble in water. It decomposes to aluminium oxide on heating or on burning (above **0) producing toxic and corrosive fumes including sulfur oxides. Its can exist with a variable number of water molecules (n close to *8), the form being Al2(SO4)3.H2O. It dissolves with clear water at the concentration of 1 - 5%. Aluminum Sulfate can exist with varying proportions of water, the common form being Al2(SO4)3.*8H2O. It is almost insoluble in anhydrous alcohol, but readily soluble in water. Above **0 decomposition to aluminium oxide is observed. Aluminium sulfate is mainly used in water treatment, dyeing, leather tanning and in the production of other aluminium compounds. The solution in water is a medium strong acid reacts with alkalis and attacks many metals in presence of water. It is widely applied as a coagulant for clarification of water treatment for industrial and drinking and in dyeing, leather tanning, in paper production, as a mordant in dyeing, and as a starting material for the production of other aluminium compounds. Another application for hydrated alumina is for the manufacture of zeolites.