Recycling Aluminum - Table 1: Melting Temperature of Alum...

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Recycling Aluminim Lab instructor: Dan Mack October 11, 2007
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Results and Discussion: Aluminum was converted to Alum according to the net reaction below: 2Al( s ) + 2KOH( aq ) + 4H 2 SO 4 ( aq ) + 22 H 2 O( l ) 2KAL(SO 4 ) 2 · 12H 2 O( s ) + 3H 2 ( g ) The goal of this experiment was to produce 23 g of pure alum. Mass produced: 15.489 g alum Percent yield, actual yield theoretical yield 100 = 15.489 23 100 = 67% was calculated to determine the extent to which the mass part of the objective was met. The melting point of the alum was measured to determine the purity of the crystals. The data appears in Table 1.
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Unformatted text preview: Table 1: Melting Temperature of Alum Trial # Melting Range Temperature ( o C) 1 80.0 - 89.5 2 90.3 - 92.9 3 90.5 - 93.0 4 91.0 - 93.2 Trials were performed until a temperature range that was reproducible three times was obtained. The melting point of pure alum is 92.5 o C. Since the ranges are relatively close to that number, the alum produced was determined to have few impurities. Conclusion: The percent yield was determined to be 67%, and the result was determined to be relatively pure....
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Recycling Aluminum - Table 1: Melting Temperature of Alum...

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