1. 6-7A Chemistry

2. Purpose Our purpose is to reclaim the greatest amount of copper possible from a solution of copper (II) chloride using a reaction involving aluminum. We hypothesize that if we have the exact amount of aluminum needed, we should have no excess aluminum remaining in the solution, and we will have 100% yield of pure copper from our reaction.

3. Preliminary Testing Aluminum Shot Aluminum Foil Hypothesis: less surface area, slower reaction Conclusion: slow and inefficient Hypothesis: more surface area, quicker reaction Conclusion: fast and efficient

4. Procedure Using DA, determine correct amounts for highest efficiency reaction Carefully measure CuCl 2 and Aluminum foil Combine CuCl 2 and Aluminum in beaker Find the mass of filter paper Filter through filter paper into Erlenmeyer flask Wash the solid, and let it dry Measure dry mass Subtract mass of filter paper from dry mass

5. Procedure: Visualized

6. Measurements 274.5 mL CuCl 2 3.1 g Al 0.9 g filter paper (average) 7.5 g net dry mass 5.6 g final dry mass of copper product

7. Percent Yield 128.9%

8. Analysis of Errors Copper oxidation caused weight gain Remnant aluminum particles Dust, skin, hair

9. Conclusion Lack of sterile environment caused errors Most efficient method of extracting copper from cupric (II) chloride Fewer trials = less loss of product on equipment Time/materials constraint

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