Lab #3 - Recycling Aluminum

Lab #3 - Recycling Aluminum - Results and Discussion...

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Results and Discussion: Aluminum was converted into alum. Alum is a name for a group of compounds with the general formula MM’(SO 4 ) 2 . 12H 2 O, M is a monovalent cation and M’ is a trivalent cation. In this experiment the alum was specifically potassium aluminum sulfate dodecahydrate (KAl(SO 4 ) 2 . 12H 2 O). 1. 50ml of KOH was added to 1.0g of Aluminum and then heated on a hot plate. The reaction was complete when the solution stopped bubbling which meant no more H 2 gas was being evolved. The aluminum pieces melted and the solution changed to black. Then the solution was filtered using gravity filtration. After filtration the solution was clear. The black residue remained in the filter paper. 2 Al(s) + 2 KOH(aq) + 6 H 2 O(l) → 2 K + (aq) + 2 Al(OH) 4 (aq) + 3 H 2 (g) 2. Then 5 ml of H 2 SO 4 was added. A white precipitate was produced. Al(OH) 4 - (aq) + H + (aq) → Al(OH) 3 (s) + H 2 O(l) 3. The remaining 15ml of H 2 SO 4 was added. The solution was filtered again to remove the solid precipitate. The solution turned from foggy to clear.
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  • Fall '05
  • Chemistry, 2 K, 5 mL, 1.0g, Alum, 1.30%

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