Chem 207 Lab writeup 3 - Recycling Aluminum Results and...

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Recycling Aluminum
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Results and Discussion: This experiment was done with the intentions to have a theoretical yield of approximately 18g of alum. The actual yield was 7.80g of alum. This was found by taking the weight of the filter paper and weighing boat without the alum, which weighed 13.6g, and taking its weight with the alum, which was 21.4g. The amount of alum given to the lab instructor was only 6.84g because some of the alum was lost during the procedure and the transfer. To find the theoretical yield, the net of reactions 1-4 was used. 2Al(s) + 2KOH(aq) +4H 2 SO 4 (aq) + 22H 2 O(l) 2KAl(SO 4 ) 2 • 12H 2 O +3H 2 (g) The atomic weight of Al is 26.982g, but only 1.024g were used. Therefore 1.024g must be divided by 26.982g/mol. This makes it .03795mol of Al. Since Aluminum was the limiting reagent and the ratio of Aluminum to Alum is equal, we can use .03795mol for the Alum. The atomic weight of Alum is 474.38g/mol. Multiplying that by .03795mol gives us 18g of Alum.
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Chem 207 Lab writeup 3 - Recycling Aluminum Results and...

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