chemlab5 - Page 1 of 3 Name: Christina Hong 0862620 Quiz...

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Unformatted text preview: Page 1 of 3 Name: Christina Hong 0862620 Quiz Section: AR Partner: Travis Hyunh 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 in manual) vs. Silver vs. Silver (Black Lead on Ag/AgCl) (reverse leads) Values Values 1 (Ag) - Reference 0.56-0.55 0.78 0.80 6 pts 2 (Zn) - Reference-0.78 0.78-0.56-0.76 3 (Pb) - Reference-0.36 0.36-0.14-0.13 4 (Cu) - Reference 0.223-0.11 0.33 0.34 E o (V) E o (V) 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+ and write the spontaneous reactions for each pair of half cells. How is this accomplished? ( 5 pts ) In order to measure the standard reduction potentials of Ag/Ag+,Pb/Pb2+, Cu/Cu2+ and Zn/Zn2+ I will be using a Ag/AgCl reference electrode and a voltmeter to measure the standard reduction potentials of the half-cells. For each half-cell I will be putting about 3 cm in depth of the metal ion solution in a glass tube with the bottom of it covered in a dialysis film. Then, I will be placing the appropriate metal into each of the solutions. Finally, I will be measuring the standard reduction potentials with the voltmeter and the reference electrode. For each half-cell I will be asked to calculate the Ecell. The equation I will be using is Ecell=Ecathode-Eanode. The Ag/AgCl reference electrode has the equation: AgCl(s) +e- --> Ag(s) +Cl-(aq) E=0.22V. The remaining goals are to construct a) a battery with E = 1.7 V and b) a cell with E cell = 0.50V. How are these accomplished? ( 5 pts ) In order to construct a battery with E=1.7V, I will be asked to determine which two half-cells can be connected to make a total voltage of 1.7V or greater. I will be looking for which half-cell is the anode and which is the cathode. Then, I will determine which two half-cells make a total voltage of 1.7V or greater by calculating each pair of half-cells. I will be using the equation Ecell=Ecathode-Eanode.1....
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This note was uploaded on 04/13/2010 for the course CHEM 152 taught by Professor Chiu during the Winter '08 term at University of Washington.

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chemlab5 - Page 1 of 3 Name: Christina Hong 0862620 Quiz...

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