Lab 2 Proposal - Lab 2 Proposal Chemical composition of...

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Lab 2 Proposal: Chemical composition of pennies Andrea Carter Claudio Gamez Angel Covarrubias Kristie Wiseman Introduction: Throughout the years, the composition of the penny (one cent coin used in the United States) has been changed due to its costly makeup. Pennies can be quite pricey to make and thus a change was made in 1983. In this experiment, we will assume that the pre-1983 pennies and post 1984 pennies both consist of copper and zinc. The major change made in the penny was the mass % of copper and zinc. We will determine the mass percent of copper and zinc for both pre-1983 and post 1984 pennies. We will use the Beer-Lambert Law and PASCO Spectrometer system to determine these findings. Materials: -Cu+2 solution -HNO3 (nitric acid) -Spectrometer -Pennies Procedures: 1. Make three dilutions from 0.1M Copper solution. The concentrations should be 0.05M, 0.025M, and 0.0125M. 2. Measure absorption of the three concentrations of Copper solution. There should be no more than 4 mL of solution in the testing vials.

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