Potassium alum, potash alum, tawas, or potassium aluminum sulfate is a chemical compound: the potassiumdouble sulfate of aluminium. Its chemical formula is KAl(SO4)2 and it is commonly found in its dodecahydrate form as KAl(SO4)(H2O). Alum is the common name for this chemical compound, given the nomenclature of potassium
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