Lab5_Electrochemistry

Lab5_Electrochemistry - Name: Kevin Stock 0760631 Quiz...

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Page 1 of 3 Name: Kevin Stock 0760631 Quiz Section: BV Total Points = 60 (5 notebook, 55 template) Standard Potentials vs. Silver/Silver Chloride Reference Electrode Cell Numbers Potential, V Potential, V Experimental Literature (page 37) vs. Silver vs. Silver (Black Lead on Ag/AgCl) (reverse leads) Values Values 1 (Ag) - Reference 0.56 -0.56 0.78 0.80 10 pts 2 (Zn) - Reference -0.82 0.83 -0.60 -0.76 3 (Pb) - Reference -0.37 0.37 -0.15 -0.13 4 (Cu) - Reference 0.108 -0.11 0.33 0.34 E o E o EXPERIMENT 5 Electrochemistry Part I:  Standard Potentials Purpose and Method                     The first goal is to measure the standard reduction potentials of Ag/Ag + , Pb/Pb 2+ , Cu/Cu 2+  and Zn/Zn 2+ .  How is this accomplished? ( 3 pts ) In order to measure standard reduction potentials, the solutions in question must be tested against a common reference solution. To test  them, we will create electrochemical cells with each given solution and a reference solution (composed of Ag/AgCl). The reference  electrode is used to measure relative measurements for all of the half cells. In order to measure the standard reduction potentials, a  current is established that flows through the anode (either a given half cell or the reference electrode) and into the cathode, at which point  it flows through a salt bridge back into the anode. A meter connecting the two electrodes measures the potential between the half cells. The second goal is to construct a cell with E cel  = 0.50V.  How is this accomplished? ( 3 pts ) After establishing the standard reduction potentials of the provided half cells, it is fairly simple to construct a cell with a potential of 0.50V. 
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Lab5_Electrochemistry - Name: Kevin Stock 0760631 Quiz...

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