MS-EST143_HW6-7_2011 - MS/EST 143, Problem Set #6-7...

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1 MS/EST 143, Problem Set #6-7 assigned 05/05/11 due 05/18/11 1. Consider the behavior of a hydrogen-oxygen fuel cell in which protons are the mobile species in the electrolyte. Derive the Nernst potential. Does it differ from the result in which oxygen ions are mobile? (Yes/No and explain using your derivation above.) What assumptions are made about the system in determining the Nernst potential? What experimental conditions are necessary in order to measure a given Nernst potential in terms of the nature of the gases supplied to the two electrode chambers? 2. The standard fuel cell potential describes the Nernst potential when all species are in their standard states. Can the standard potential be routinely measured in fuel cell experiments? Why or why not? Can it be measured in batteries? Why or why not? 3. The material Na 2 SO 4 is a sodium ion conductor. Let an electrochemical cell constructed with this material as the electrolyte be exposed to a gradient in SO 3 gas phase concentration, high concentration of SO 3 gas on one side and low on the other. Derive an expression for the voltage generated across this cell as a function of the two SO 3 gas concentrations. 4.
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This note was uploaded on 01/03/2012 for the course MS 143 taught by Professor List during the Fall '10 term at Caltech.

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MS-EST143_HW6-7_2011 - MS/EST 143, Problem Set #6-7...

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