Thermodynamics of Galvanic Cells - Thermodynamics of...

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Thermodynamics of Galvanic Cells By Monica Parrillo Lab Instructor: Bob Neuman April 28, 2008 1
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Results and Discussion: In this experiment, a galvanic cell was constructed using solid silver and copper electrodes and a AgNO 3 and Cu(NO 3 ) 2 solutions, and a KNO 3 salt bridge. The cell was brought to various temperatures and its standard cell potential was measured at each temperature. The results from this experiment are tabulated below: The measured value for the standard cell potential, when the temperature is at 298 Kelvin, was found to be 0.360V. It is known that the actual cell potential at this temperature is 0.460V as calculated in the pre-lab exercise. Therefore, the percent error for this value is: |0.360V – 0.460V| / 0.460V * 100% = 22% One can use the equations ∆G= -nFE(cell) (where F is Faraday’s constant and n is the number of moles of electrons transferred) to calculate the Gibbs Free-Energy change for the cell at various temperatures. In this experiment, n= 2. The values for ∆G at different temperatures are tabulated below:
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Thermodynamics of Galvanic Cells - Thermodynamics of...

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