Electrochemical Cells - Temperature of the cell 25ºC Room...

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Roshni Sheth, Anne Tolene, and Phillip Pearson CH 118-M3 April 14, 2010 Electrochemical Cells 1. The Observed Cell Potentials + - Voltage Fe Sn +25.5 Sn Zn -0.440 Zn Cu -0.971 Cu Pb +0.461 2. The Multimeter If the voltage is positive, the metal attached to the positive end is the cathode, and the metal attached to the negative end is the anode. If the voltage is negative, the metal attached to the positive end is the anode, and the metal attached to the negative end is the cathode. 3. The Electromotive Series Standard Conditions Experimental Conditions How the change in conditions might affect the observed potential? Condition of the electrode Clean metal surface with no oxide layer Metal surface with small amount of oxide layer increase or decrease in the cell potential (inaccurate data) Concentration of the metal salt solution 1.00M 1.00 M increase or decrease in the cell potential
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Unformatted text preview: Temperature of the cell 25ºC Room Temperature higher cell potential with increased temperature Size of the electrode 1 cm x 1 cm x 1 mm 1 cm x 1 cm x 1 mm lower cell potential with increased size 4. The Electromotive Series From our data, the order of reducing ability from most reducing to least reducing was Sn Cu Pb Zn. The order is not the same as the theoretical data calculated in the pre-lab ˃ ˃ ˃ assignment, which was Zn Fe Sn Pb Cu. After looking at the class data, the opposite ˃ ˃ ˃ ˃ seems to be true, so the data is not correct. 5. The Relationship Between Cell Potential and Concentration The relationship between concentration of Copper Nitrate and the observed cell potential is logarithmic. As the concentration increases, the cell potential decreases, until the cell potential levels off....
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Electrochemical Cells - Temperature of the cell 25ºC Room...

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