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Discussion Lab 13 - In part one of this lab the reduction...

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In part one of this lab the reduction potentials of four different metals were measured using a voltmeter by referencing it first to silver and then to copper. This was done by creating a filter paper device in which the four metals were placed on corresponding metal ion solutions and connected together by a KNO 3 salt bridge solution. The voltage was then measured. The values obtained were very close to the actual values. In part two of the lab the reaction 2Al(s)+ 3Cu 2+ 2Al 3+ + 3Cu (s) was observed by putting a strip of aluminum in CuCl 2 solution. The E o was found by adding the half reactions Al(s) Al 3+ + 3e- (E o =1.7 V) and 2e-+ Cu 2+ Al 3+ + Cu (s) (E o =.34 V). This gave an E o cell value of 2.04 V. Because this is positive, aluminum should be dissolved and was proven true by the experiment. When the aluminum was put into solution it reacted by bubbling and turning a rusty brown color. The reaction was exothermic because steam was let out of the test tube and heat it produced.
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