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experiment 23 - Experiment 23 Electrochemistry Voltaic...

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Experiment 23: Electrochemistry: Voltaic Cells Taylor MacDonald Partner: Laura Ritchey 5/27/08 Tuesday Group #19 TA: Kodali
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Introduction The objective of Experiment 23, Electrochemistry: Voltaic Cells, is to construct several voltaic cells, measure their voltages and then investigate the effect on the cell voltage of changing solution conditions. The voltmeter (MeasureNet) was used to determine the flow of electrons (volts) from the anode to the cathode for each of the voltaic cells. For the salt bridge, a strip of filter paper with 0.1 M K 2 SO 4 dropped on was used to connect the two half cells. In part A, the voltage was measured with copper as the cathode for all of the cells and iron, magnesium, lead, tin(II) and zinc as the anodes. For Part B, the effect of different concentrations of solution was measured by diluting the concentration of the copper solution and measuring the voltage of the cell. In part C, the copper solution was changed when concentrated NH 3 and Na 2 S were added, and the voltage of three cells was taken using this new solution as the cathode. All results were recorded in the lab notebook. The concepts from Chemistry 103 being investigated are half reactions and voltaic cells. The lab techniques used in the experiment were creating a
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