experiment 7 Cu recovery 1

# experiment 7 Cu recovery 1 - Hong Le Chemistry 1A Exp 7...

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Hong Le Chemistry 1A Exp 7: Recovery and Recycling of Copper I) Objective: Recovering Copper through a cycle or reaction involving and its compounds, allowing the ultimate recovery of the used metal is weight to calculate the percent recovery. II) Procedure: page 7 III) Data : calculation of percent yield of alum 1 Mass of Cu wire 0.0856g 2 Mass of filter paper 0.8126g 3 Mass of filter paper + Cu after 1 st drying 0.8792g 4 Mass of filter paper + Cu after 2 nd drying 0.8800g 5 Mass of filter paper + Cu after 3 rd drying 0.8813g 6 Mass of copper 0.0667g, 0.0678g, 0.0688g 7 Average mass of Cu recovered 0.0672g 8 Percent of Cu recovered 78.85% Show step by step calculation: % recovery = mass of exerimentally recovered Cumass of copper wire x 100 % recovery = . . 0 0672g0 0856gx 100 = 78.85%

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IV) Conclusion: The copper was recovered about 78.85% not 100% because small amount of copper was lost during the procedure. V) Discussion: At the last step of the procedure, if too much zinc is added more than it’s needed, it will contaminates the wanted pure carbon and lead into wrong percentage recovery. What did I learn? All the solution of Cu 2+ such as CuS0 4 or Cu( N0 3 ) 2 are blue. Copper didn’t react to SO 4 2- , but with Zn. I learned how to recycling copper Investigation: 1/ Eight of essential trace metal in human body are: Iron (Fe), Chromium (Cr), Copper (Cu), Calcium (Ca), Magnesium (Mg), Manganese (Mn), Molybdenum (Mo), Zinc (Zn). Calcium:
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experiment 7 Cu recovery 1 - Hong Le Chemistry 1A Exp 7...

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