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recycling aluminum report

# recycling aluminum report - Recycling Aluminum Results and...

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Recycling Aluminum Results and Discussion: A procedure for recycling aluminum was scaled down (using stoichiometric calculations) to produce a theoretical yield of 23 grams of alum crystals using 1.31 grams of solid aluminum (from a soda can). The net reaction for this experiment was:

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2 Al( s ) + 2 KOH( aq ) + 4 H 2 SO 4 ( aq ) + 22 H 2 O( l ) → 2 KAl(SO 4 ) 2 * 12 H 2 O( s ) + 3 H 2 ( g ) After the alum crystals were produced, its mass was measured to determine the percent yield. Table 1: Alum Crystals Yield Data Theoretical Yield of Alum Crystals (g) Actual Yield of Alum Crystals (g)* 23 15.052 * The actual yield of alum crystals was calculated by: (mass of glass vial and alum) – (mass of glass vial) = 31.515g – 16.434g = 15.052g Percent yield = actual yield x 100 = 15.052g x 100 = 65% theoretical yield 23g The melting point of the alum crystals was also measured in order to determine its purity. Pure alum should have a melting point of 92.5ºC. Table 2: Melting Points of Alum Crystals Trial* Temperature At Which Alum Started To Melt Temperature At Which Alum Completely Melted
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recycling aluminum report - Recycling Aluminum Results and...

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