lab report 6 - The Composition of a Penny Introduction. In...

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The Composition of a Penny Introduction. In this experiment, a post 1982 penny was dissolved in nitric acid. The reaction was to be observed and samples were to be collected for examination. The objective of this experiment was to check if the fabricator that makes the coin planchets is putting the right amount of copper and zinc into the pennies. Beer’s Law along with the use of a colorimeter, the amount of light absorbed by the substance to determine percent composition. Experimental Procedure. A post 1982 penny was placed in nitric acid. A chemical reaction occurred while cuvettes were being filled. One cuvette held de-ionized water, which served as a control to balance the colorimeter before each other cuvette filled with diluted copper stock solution. The copper standards were .500M, .100M, .150M, and .200M of diluted copper stock solution. A sample of the nitric acid solution with the dissolved penny contents was collected. The cuvettes (7 total) were placed in a colorimeter where the absorbance was measured for each
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This note was uploaded on 04/12/2011 for the course CHM 2045L taught by Professor Horvath during the Spring '07 term at University of Florida.

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lab report 6 - The Composition of a Penny Introduction. In...

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