Lab Report #4 - Recycling Aluminum by Richard Salvagno Lab...

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Recycling Aluminum by Richard Salvagno Lab Instructor: Michael Coleman September 21, 2009
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Purpose: The purpose of this lab was to scale down the given procedure in the lab manual in order to prepare a theoretical yield of 23 g of alum. After completing the scaled down procedure of recycling aluminum to yield alum, the melting point of the alum crystals was to be found. Procedure: (The procedure that was given in the lab manual was scaled down to a proportion that is realistic for the lab setting.) An aluminum can was cut into several small strips and 1.298 g of the strips was measured on the electronic balance. The aluminum was then placed in a 600 mL beaker. Under the fume hood, 67 mL of 1.4M KOH was added to the beaker containing the aluminum. The solution was gently heated on the hotplate until the production of gas ceased. The reaction between the 1.4M KOH and the aluminum strips can be expressed as: 2 Al (s) + 2 KOH (aq) + 6 H 2 O 2 K + (aq) + 2 Al(OH) - 4 (aq) + 3 H 2 (g) Once this reaction was complete, the solution was gravity filtered and any remaining solid residue was removed. During filtration, the residue was rinsed twice with small (60 mL or less) portions of distilled water. The residue was discarded afterwards. In a beaker, 6.7 mL of H 2 SO 4 was obtained and about 1.7 mL of the H 2 SO 4 was slowly added to the solution in the beaker. The beaker was gently heated and continuously stirred while the acid was added. The remaining acid was added in increments. The reaction between the sulfuric acid (H
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Lab Report #4 - Recycling Aluminum by Richard Salvagno Lab...

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