Experiment 3 - Recycling Aluminum Naoki John Yoshida Tyi...

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Recycling Aluminum Naoki John Yoshida Tyi McCray 10/06/2008 Purpose
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The purpose of the experiment was to scale down the given procedure in order to produce a theoretical yield of 23 g of alum from strips of aluminum taken from an aluminum can. Data Mass of Aluminum (s) obtained: 1.312g Mass of filter paper+ weighing boat: 8.120g Mass of filter paper+ weighing boat+ alum crystals: 23.740g Mass of alum: 15.620g Melting Range: Start (˚C) End (˚C) Trial 1 87.0 87.5 Trial 2 89.0 90.5 Trial 3 88.0 91.0 Calculations Percent Yield of Alum: × %= . . × %= . % Actual YieldTheoretical Yield 100 15 620g23 0g 100 67 9 Accepted value of alum melting point: 92.5 ˚C Example of Percent Error Calculation:
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- × %= . - . . × %= . % Accepted ExperimentalAccepted 100 92 5 87 092 5 100 5 9 Trial 1 Start Trial 1 End Trial 2 Start Trial 2 End Trial 3 Start Trial 3 End % Error (%) 5.9 5.4 3.8 2.2 4.9 1.6 Balanced Equations + + + + ( ) - ( )+ ( ) 2 Al s 2 KOH aq 6H2O l 2 K aq 2 Al OH 4 aq 3H2 g - + + + ( ) AlOH4 aq H aq
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Experiment 3 - Recycling Aluminum Naoki John Yoshida Tyi...

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