Reformation of Copper

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Reformation of Copper Jessica Thomas*, Vanessa Puente, CHEM 111, Section 534 Introduction One topic that many scientists are well interested in researching is the copper cycle. In this experiment, copper goes through many chemical reactions and ends back to copper. The purpose of this experiment is to determine whether there is a gain or loss in copper and understand the different chemical reactions taken place throughout the experiment by using the percent yield function. Materials and Methods The materials used in this experiment include the following: 50 mL beaker, hot plate, plastic funnel, aspirator, rubber tubing, ring stand, clamp, iron ring, weighing boats, magnetic stir bar, 10 ml graduated cylinder, disposable pipet(s), filter flask, Buchner funnel, filter paper, distilled water bottle, stirring rod, watch glass, and red litmus paper. After gathering the materials, the first part was to place the beaker (which is attached to the ring stand) on top of the hot plate. Next, a fume hood was made by using a funnel, rubber tubing, and aspirator. Copper was then measured to .2544 grams and was poured that into the beaker. After that, 5 mL of HNO3 was poured into the copper with the aspirator turned on. Once the dissolving completed, 10 mL of distilled water was poured into the solution. The 6M NaOH was added dropwise while the solution was stirred. Once the solution changed colors, it was tested with red litmus paper. After placing the beaker on the hot plate, with a stir rod, for around five minutes, it was stirred until the solution turned black. After allowing the solution to sit for a few minutes, the liquid portion was separated into a waste container using a pipet. Once 10 mL of distilled water was added, 9 mL of 3 M H2SO4 was added dropwise until a color changed occurred. Then, 5 mL of distilled water was added to the remaining mixture and

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