Lab #5 - A Cycle of Copper Reactions Sylwester Czado...

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A Cycle of Copper Reactions Sylwester Czado Chemistry 191 Lab Report, Experiment #5 Lab Partners: Ellen Richer, Michael Folcarelli, and Bukola Bakare Instructor: Brian Corbett 10-6-05
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Introduction The purpose of doing this particular experiment was to observe a sequence of reactions of copper that form a cycle. The color and physical property changes which indicate the reactions. This will teach me to record observations and interpret them as chemical equations. We are using this particular method to learn a classification scheme for grouping chemical equations by reaction type. I will also practice quantitative laboratory techniques by finding the percentage of the initial sample of copper that is recovered. Procedure Special Supplies: Infrared lamps or steam baths (hot plate), 250-mL beaker, glass rod, spatula (rubber policeman), and porcelain evaporating dish. Chemicals: 18-20 gauge copper wire (30 cm), concentrated (16 M) HNO 3 , 3 M NaOH, 6 M H 2 SO 4 , 30-mesh zinc metal, 6 M HCl, and methanol. Safety Precautions: HNO 3 , concentrated nitric acid, is hazardous so use a fume hood with safety glasses and rubber gloves. Rinse your hands after handling HNO 3 . The dissolution of the copper wire with HNO 3 should be done in a fume hood. NaOH solutions are corrosive to the skin and the eyes so wear safety glasses. Methanol and acetone are flammable and their vapors are toxic. Use them in the hood and keep them away from open flames. Waste Collection: In Step 5, a solution contains zinc sulfate and zinc chloride. Therefore, it has to be collected with the methanol in another waste container.
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1. Cu to Cu (NO 3 ) 2 : Cut the copper wire which weighs 0.5 g to 30 cm in length. Make it bright and shiny by cleaning it with steel wool, rinsing it with water, and drying it with a tissue. Weigh and record it to the nearest milligram. Coil the wire into a flat spiral and place it in the bottom of a 250-mL beaker. In the fume hood, add 4.0 mL of concentrated (16 M) nitric acid, HNO 3 . Swirl the solution around
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Lab #5 - A Cycle of Copper Reactions Sylwester Czado...

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