Stock Photo - Alum crystals (formula: KAl(SO4)2. 12(H2O)) made from aluminum foil, potassium hydroxide, a strong base, and concentrated sulfuric acid (H2SO4).

Stock Photo: Alum crystals (formula: KAl(SO4)2. 12(H2O)) made from aluminum foil, potassium hydroxide, a strong base, and concentrated sulfuric acid (H2SO4).

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