3 ways to extract aluminum sulfate.

2AL + 3H2SO4 = AL2 (SO4) 3 + 3H2 – when adding sulfuric acid to aluminum
2AL (OH) 3+ 3H2SO4 = AL2 (SO4) 3 + 6H2O – when adding sulfuric acid to aluminum hydroxide
AL2O3 + 3SO3 = AL2 (SO4) 3 – when adding sulfur oxide to aluminum oxide



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