Copper Cycle Lab - Copper Cycle Lab September 14, 2005...

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Copper Cycle Lab – September 14, 2005 Introduction The purpose of the experiment was to start out with solid copper and end up with solid copper at the end with five reactions total. The Law of Conservation of matter was used here because the law states that matter cannot be created or destroyed, it can only be changed. If this is true, then the amount of copper that was used in the first reaction should be the same amount of copper that resulted in the last reaction, no matter how many times the copper is changed. There should not be more copper nor should there be less copper. Also, the concept of a precipitate forming was applied to the experiment. A precipitate occurs when two solutions are mixed and a solid, insoluble substance forms. The reaction is called a precipitation reaction and the solid is called a precipitate. For example, when K 2 CrO 4 is mixed with Ba(NO 3 ) 2 , a yellow solid forms which is BaCrO 4 . Similarly, in this experiment a solid also forms when mixing copper (II) nitrate and sodium hydroxide which forms copper (II) hydroxide. Safety The first reaction yielded a brown gas which was nitrogen dioxide. The gas was not smelled because it was dangerous. The reaction was placed under a fume hood and the lower hood was open because the gas was heavier than the air. If for any reason, an acid or a base came in contact with the skin, it washed rinsed immediately with water. When a reaction was taking place in a beaker, the beaker was not touched because the reaction can generate heat and can burn the hands. Procedure
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A 2.0 gram strip of copper was obtained along with 10mL of 8.0 M nitric acid in a test tube. The test tube was put in a test tube rack for the reaction. When both the copper and the test tube of nitric acid were under the fume hood, the copper strip was put inside the test tube for a reaction. While the reaction was happening, a large test tube was massed and filled with 40 mL of 3.0 M sodium hydroxide. After 10 minutes had gone by, the copper solution was added to the sodium hydroxide very slowly, drop by drop. After all of the copper solution was added to the larger test tube, the smaller one was rinsed out
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This note was uploaded on 04/14/2008 for the course CHEMISTY 10101 taught by Professor Denofrio during the Spring '08 term at University of Illinois at Urbana–Champaign.

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Copper Cycle Lab - Copper Cycle Lab September 14, 2005...

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