Densities of Liquids and Solids

Densities of Liquids and Solids - Recycling Aluminum by...

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Recycling Aluminum by Megan Lawless Lab Instructor: Mr. Hoch October 12, 2007
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Results and Discussion: The purpose of this lab was to scale down a given procedure to prepare a theoretical yield of 23 grams of alum from aluminum. In this experiment, approximately 1.30 grams of aluminum was needed to have a theoretical yield of 23 grams of alum. An aluminum can was cut up and 1.30 grams was obtained. Then the aluminum was cut into very small strips. These strips were placed in 600 mL beaker, and 65 mL of a 1.4 M potassium hydroxide solution (KOH) was added under a fume hood. The beaker was then heated on a hotplate until the gas production ceased. Bubbles were produced during the heating, the strips of aluminum floated to the surface, and the solution became very dark in color. It appeared that all of the aluminum was dissolved. The reaction that had occurred was 2 Al( s ) + 2 KOH( aq ) + 6 H20( l ) 2K + ( aq ) + 2 Al(OH) 4 ( aq ) + 3 H 2 ( g ) Once the solution had stopped bubbling, it was gravity filtered. The filtered solution was colorless. The residue in the filter was rinsed twice with a small amount of water and then
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