6.Measure the potential of the first cell by connecting M1to M2. This is done by bringing the positive terminal or lead of the voltmeter into contact with M1(copper) and the negative terminal in contact with the other metal M2. If the voltage displayed in the meter is negative, then reverse the terminals. Recall that the + terminal is the cathode and that reduction takes place there, thus you are measuring oxidation potentialsand will need to change their sign to report them as reduction potentialsin Data Table 2. 7.With a positive voltage displayed, wait about five seconds to take a voltage reading and record the value in DATA TABLE 1. Be sure to press down on the metal piece in order to make good contact. Also record which metal is the positive terminal and which is negative. Use the same procedure to measure the potential of the other three cells , M1to M3, M1to M4, and M1to M5, continuing to use M1(copper) as the reference electrode, thus it remains connected to the positive terminal of the voltmeter and negative voltage readings are possible. 8.Analyze your data thus far and arrange the five metals from the highest (most positive) reduction potential to the lowest (most negative) reduction potential. Metal M1(copper) will be assigned an arbitrary value of 0.00 V since it is used as a reference electrode. 9.Using the voltmeter, measurethe potential of the remaining possible spontaneouscell combinations. If the sodium or potassium nitrate solution has dried (or if any of the other solutions have dried), you may have to re-moisten it. Record each measured spontaneous cell potentialin Data Table 3 and identify which metal was the cathode and the anode for the spontaneouscell. 10.Calculatethe predicted potentials for the remaining possible spontaneouscell combinations and record each calculated potentialin DATA TABLE 3. Show your calculations within the data table. 11.When you have finished collecting data, use forceps to remove each of the pieces of metal from the filter paper. Rinse each piece of metal with tap water. Dry it and return it to the correct container. Remove the filter paper from the Petri dish using forceps and discard it in the trash. Rinse the Petri dish with tap water, making sure that you do not touch the chemicals.