chem 208 lab 8 - Exp. 8: Thermodynamics of Electrochemical...

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Exp. 8: Thermodynamics of Electrochemical Cells Caitlin Burrows TA: Lijun Fan Due: May 4, 2005
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Abstract : The purpose of this experiment was to measure the standard cell potential as a function of temperature for a galvanic cell. By measuring voltmeter readings at various temperatures we were able to find a relationship between the ln(K) and 1/T when the temperature was measured in Kelvin. This relationship (with y being ln(K) and x being 1/T) was y = 15639x - 20.575. Then, by knowing the slope and y-intercept of this line we were able to calculate the standard enthalpy to be -130 kJ/mol and the standard entropy to be -0.171 kJ/mol*K. Our percent error of the standard enthalpy was 11.4 %, while our percent error for the standard entropy was 12.0%. Introduction: A galvanic cell is one that relies upon a spontaneous chemical reaction to generate an electrical current; by completing this experiment we hoped to be able to find a standard cell’s potential as a function of temperature for this type of cell. By setting up an apparatus that allowed an oxidation-reduction reaction to take place, some of the chemical energy released by the reaction was able to be extracted and converted to electrical energy. Then, by measuring a voltmeter’s reading at various
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chem 208 lab 8 - Exp. 8: Thermodynamics of Electrochemical...

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