As most of us know, Alum - Al2(SO4)3 18H2O or Al2(SO4)3 14H2O - is used for coagulation process. But, why do we express the concentration of alum like "8.5% Al2O3" or "17% Al2O3"? Is it because making Al2O3 is cheaper than Alum? Then, why do we say "we use alum as coagulation chemical" instead of "we use aluminum oxide as coagulation chemical"?
What is the relationship between Alum and Al2O3?
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