Chem152_Electro_Report - Name Sienna Hiebert Quiz...

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Page 1 of 3 Name: Sienna Hiebert Quiz Section:BB Total Points = 60 Standard Potentials vs. Silver/Silver Chloride Reference Electrode Cell Numbers Potential, V Potential, V Experimental Literature (page 37) vs. Silver vs. Silver See Help Box below. (Black Lead on Ag/AgCl) (reverse leads) Values Values 1 (Ag) - Reference 0.56 -0.55 0.78 0.80 10 pts 2 (Zn) - Reference 0.77 -0.77 0.99 0.76 3 (Pb) - Reference 0.37 -0.37 0.59 0.13 4 (Cu) - Reference -0.13 0.12 0.09 -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? ( 5 pts ) In order to measure the standard reduction of the chemicals one shall create electrochemical half-cells. This is done by, firstly, putting KNO3 in a jar,  which will create a salt bridge for the solutions. Then each of the solutions are added to specimen tubes, which are sealed at the bottom using  celophane and rubber bands (very high class). Using a Fluke meter (reading DC volts) one should measure each half-cell using  Ag/AgCl+ specimen  as a reference electrode.This is done by putting one connecting aligator clip to the reference cell and comparing that value to the specimen that the  other aligator clip is attached to. Record all these values of each specimen and then reverse the aligator clips and do the calculations again. These  values should be the same as the orginal one, except they are the inverse. 
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