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lab 4 electrochemistry

lab 4 electrochemistry - Vilnits Rada Vilnits Laboratory 4...

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Vilnits Rada Vilnits Laboratory 4 Chemistry 112 20 March 2008 Electrochemistry Abstract The purpose of this laboratory experiment was to see how batteries actually work. A battery involves two important parts, a chemical reaction and wires connected to an electrical device. In this experiment, we had to perform two separate battery-like operations. The first apparatus that we had to set up consisted of a beaker with solid zinc and copper sulfate solution in it with two carbon rods sticking out with a wire connected to each; which were also connected to a voltmeter. The second apparatus consisted of two beakers separately with zinc ion, zinc metal, and in the other copper ion and copper metal with a carbon rod, also connected to the voltmeter. Amazingly, there were two different results of each experiment. This lab will make clear why this happens. During the second week, for part 2, a salt bridge wasn’t used, instead we used a porous cup and measured the voltage inside it at a certain temperature and our results showed that at different temperatures, different results occurred. Intro In this experiment we need to create two different processes which seemed to be the same but however, turned out to be totally different. The first experiment was in one beaker (electrolysis) and the second one was the same thing except the two substances were separated 1
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Vilnits into two beakers (galvanic cell) and different results were obtained for both experiments. For the second week, the experiment seems significantly similar, however with changes in temperature; and the results were significantly different than those in the first week when temperature had no role in the experiment. The substances used are as follows; Copper Sulfate (aq) [Blue] & Granular Zinc(s) solid [silver lustrous metal]; when mixed together, solution has black deposits and the solution is no longer blue, it turns dark green and the zinc’s final color is brick red/orange. In the first week’s second setup, the salt bridge (KNO3) was a clear solution in a u- shaped tube with each end in a beaker filled with 1) CUSO4 and 2) ZnSO4. In the second week; we used 0.1M K4Fe(CN)6 [yellow chunks] and 0.1M K3Fe(CN)6 [orange powder] and ml of acetic acid buffer (clear liquid) in addition to the carbon rods which were used in both weeks.
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