Part B-Measuring Electrode Potentials Copper electrode zinc haif cell Measured cell potentials and polarity I Get a sample tube and a piece of metal for cach of the half-cells listed on the right. Also get one pre-asembled copper half-cell (as shown in the photo on the let below). Half-Cells From the photos you can see that the Cell constructed from Cu"Cu withe ZaZn Sa"Sn Za| Za copper half cell (copper wire in glass tube) Measured Fe is connected to the VOmA terminal on the 2 Half fill cach sample tube with the I M solution of the appropriate metal cation. 3. Insert a two holed plastic cap into cach tube and insert the piece of clean metal (Zn, P. or Sn) appropriate to the cell into one hole. Each group should have a set of cells as Ph multimeter (follow the red and black wires). Is the copper electrode pasitive or negative relative to the other metal? and since all the voltages shown on the picturod on the right below. multimeter are positive, you can work out whether the copper electrode is positive or Calculations negative with respect to the other metal For cach of the cells you constructed, indicate the potential of the other half-cell with respect to the coper half-cell on the diagram below. If the copper half-cell is positive relative to the other metal electrode, the other metal electrode will be to the left of the copper eloctrode on the diagram, and vice versa. (E for Cu"Cu034 V) (see the instructions for using a multimeter in the lab manual). You can also see the size of the potential difference for each cell from the multimeter reading standard hydrogen electrode Cu" ICu Copper electrode lead halif cell ZaZn • potential/V 00 +034 4. Starting with the Zn"| Za half-ell, insert the copper half-cell into the second hole in the plastic cap (as shown in the picture below). Make sure the bottom of the copper half-cell dips well into the solution in the tube. standard hydrogen electrode Cu"I Cu potential/V 00 +0.34 standard hydrogen electrode Cu" ICu SaSa + potential/V 00 +0.34 Use the diagrams above to doduce the potential of cach of the XX half cells with respect to the standard hydrogen eloctrode. These are the standard reduction potentials for the metals. Attach the lead from the VOA terminal of the multimeter to the Cu electrode and the other lead (from the COM terminal on the voltmeter) to the other metal in the cell. Recoed the voltage produced by the cell. Determine whether the Cu half- cell is the positive or negative electrode. The multimeter shows a positive reading if the electrode connocted to the VOA terminal is positive with respect to the electrode connected to the COM terminal. Since you have connected the copper Copper electrode tin half cell Show your working for cakulating " for the Za"Zn half el clectrode to the vDA terminal, a positive reading tells you that the copper electrode is the more positive of the two electrodes in the cell. Disconnect the multimeter from the cell when you have completed your reading Make sure you determine the cell voltage and whether the copper half-cell is the more positive before you disassemble the cell. 5. Repeat step 4 for the P2| Pb and the Sn2 | Sa half-cells. Se"Sn 6 Disassemble the cells and discard the metal solutions into the heavy metals waste container. Rinse the oquipment, including the metals, before returming them to where you got them Experimental (refered to standandH"|H2 half cell) Literature "V (From SI Chemical Duta)