Lab report 2 - Recycling Aluminum by Rachel Soffer Lab...

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Recycling Aluminum by Rachel Soffer Lab Instructor: Kaushik Nanda Oct 3, 2007
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Purpose: To perform an experiment with a theoretical yield of approximately 23 grams of Alum that will maximize the percent yield and have a melting point of 92.5ºC. Results and Discussion: Producing Alum from Aluminum In the first week of the experiment, 1.308g of Aluminum were used to yield 23g of Alum. Based on the following reactions: 2 Al(s) + 2 KOH(aq) + 6H 2 O(l) → 2 K + + 2 Al(OH) 4 (aq) + 3 H 2 (g) Al(OH) 4 ‾(aq) + H + (aq) → Al(OH) 3 (s) + H 2 O(l) Al(OH) 3 (s) + 3 H + (aq) → Al 3+ (aq) + 3 H 2 O(l) K + (aq) + Al 3+ (aq) + 2 SO 4 2 ‾(aq) + 12 H 2 O(l) → KAl(SO 4 ) 2 • 12 H 2 O(s) net reaction 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) was given. Using the net reaction, measurements for the other reagents were calculated and results were tabulated (Table 1): Table 1: Measurements of reagents Reagent Amount used (mL) 1.4 M KOH 65.0 9 M H 2 SO 4 26.2 95% ethanol 17.21 H 2 O (to combine with ethanol) 16.35 In week 1, The combined mass of two pieces of filter paper and the weighing-boat in was 7.666g
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