Lab 13 - Redox Reactions

B write a half reaction for what happened to this

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Unformatted text preview: n order from most negative to most positive. Que s tion 6: Consider the reaction involving magnesium metal. a With what compound, element or ion did magnesium react? b Write a half- reaction for what happened to this chemical. You may use a Table of Standard Reduction Potentials for help. c Write the balanced equation for the reaction that occurred between magnesium metal and this chemical. Que s tion 7: You also observed a reaction with zinc metal. a With what compound, element or ion did zinc react? b Write a half- reaction for what happened to this chemical. You may use a Table of Standard Reduction Potentials for help. c Write the balanced equation for the reaction that occurred between zinc metal and this chemical. Que s tion 8: Based on your answers to Question 5, will either of these combinations produce a reaction? a www.webassig n.net/ebooks/wsug encheml1/lab_13/manual.html 8/10 4/15/13 Lab 13 - Redox Reactions Cu + Mg2+ b Cu2+ + Mg Part B: Half-Cell Potentials 1 Go to the side shelf where the electrochemical cells are set up for Part B. If the salt bridges are not inserted into the solutions as shown in Figure 3 below, please let your instructor know. Figure 3: Electrochemical Cell Setup 2 For the Copper- Copper cell, attach the black alligator clip lead to one of the copper wires in copper solution. The copper wire should not be completely submerged. 3 Next attach the red alligator clip lead to the other copper wire in copper solution. This wire should not be completely submerged either. 4 Measure the potential (in millivolts) and record it in Data Table B1. This value should be very close to 0.0 mV since there is no potential difference between copper and itself. If you do not find this result, consult your instructor. 5 When you are finished taking your measurement, remove the leads from the wires and leave the set up the way you found it. 6 Repeat steps 2 - 5 for the three remaining cells, always attaching the black alligator clip lead to the copper half- cell. The Silver- Copper cell should have a positive cell potential. If it does not, consult your instructor. 7 Convert the cell potentials in Data Table B1 to volts. www.webassig n.net/ebooks/wsug encheml1/lab_13/manual.html 9/10 4/15/13 Lab 13 - Redox Reactions 8 Enter the four couples into Data Table B2, arran...
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