ChemLab (Aluminum)

ChemLab (Aluminum) - Recycling Aluminum October 2 2007...

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Recycling Aluminum October 2, 2007
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Results and Discussion: This experiment’s purpose was to recycle aluminum to produce a theoretical yield of 23 g of alum crystals. The reaction that occurred upon adding KOH to the aluminum strips and heating is described by the equation: + + + + ( ) - + ( ) 2 Al s 2 KOH aq 6 H2O l 2 K aq 2 Al OH 4 aq 3 H2 g When heated, the aluminum and KOH mixture produced a gas (hydrogen) and turned a grayish color. The strips of aluminum gradually dissolved. The initial reaction that occurred by adding a small amount of H2SO4 is described by the equation: ( ) - + + ( ) + ( ) Al OH 4 aq H aq Al OH 3 s H2O l The solution formed a white precipitate ( ( ) Al OH 3 s ). Additional H2SO4 was added, and the second reaction that occurred is described by the equation:
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( ) + + + + ( ) Al OH 3 s 3 H aq Al3 aq H2O l The precipitate in the solution dissolved. The reaction that occurs upon cooling the resulting solution is described by the equation: + + + + - + ( ) * ( ) K aq Al3 aq 2 SO42 aq 12 H2O l KAl SO4 2 12 H2O s White crystals were produced upon vacuum filtering the water out of the result.
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