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C-1. DETERMINE THE E° FOR A VOLTAIC CELL For each cell write the anode half reaction...

C-1. DETERMINE THE E° FOR A VOLTAIC CELL For each cell write the anode half reaction and the cathode half reaction. From the measured voltages, calculate the half-cell potentials for the lead and tin half-cells and the equilibrium constants for these two reactions. In these calculations, use E° = 0.34 V for the Cu2+/Cu couple.

Cell trial 1 trial 2 trial 3
Cu-Pb 0.505 V 0.506 V 0.508 V
Cu-Sn 0.688 V 0.688 V 0.691 V
Pb-Sn 0.190 V 0.190 V 0.190 V

C-2. MEASURING CELL POTENTIAL AS A FUNCTION OF TIME Calculate ΔG for the cell at each of these temperatures. Plot ΔG as a function of temperature and obtain a best fit line. The slope will be –ΔS. From the values for free-energy, and entropy calculate the enthalpy at 298K.

Cu-Sn (temp in Kelvin) Voltage
383 0.731 V
328 0.726 V
313 0.717 V
298 0.707 V
274.4 0.680 V
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