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272 EXPERIMENT 19 The Electrochemical Cell Analysis 1. Report the value of the reduction potential based on your results from Part I Use Equation (19-5), and the knowledge that Em (Zn2+Z) = -0.76 V. LA. Fe2+ | Fe -0.49V I.B. Cu2+ Cu +0.15V I.C. Mg?* | Mg -12V Note that in the case above where zinc is not the anode, you will need to rewrite Equation (19-5) appropriately 2. Use the data from Question 1 above to predict the cell voltages below. List the experimentally observed values from Part II in the second column, and give the percentage error in the third column. Predicted Observed Percentage value from value from data in Part 1 Part II Fel Fe2+1 Cu Cu2+ Mg Mg2+ ||Fe Fe2+ Mg Mg2||Cu Cu2+ 3. Compare the reduction potentials calculated in Part I with values for the standard state taken from a reference of your choice. Reference consulted (give full bibliographic record): error a Value determined in Part 1 Literature value for standard state Percentage error Fe2+ Fe Cu+ Cu Mg2+ | Mg