Unformatted text preview: 2 of the metal M in an acid solution of unit activity bubbled with pure hydrogen [unit pressure]. How might the potentials be measured experimentally? From your plot [data, not cemetery], determine the corrosion rate [A/cm 2 ] and the exchange current density for the hydrogen reduction reaction on the surface of metal M. Comment on the accuracy of your determinations. 0.1 10-6 0.10 2H + + 2e-= H 2 0.1 10-8-0.70 M +1 + 1e-= M b , V j o , A/cm 2 E Nernst , V SHE reaction My sign convention will result in a positive value for b since I define h in such a way that it is always positive. Otherwise, b can be negative with a negative overpotential for a process. ...-0.5663-5x10-3-0.7375-1x10-1-0.5287-2x10-3-0.7117-5x10-2-0.5075-1x10-3-0.6425-2x10-2-0.4939-5x10-4-0.6267-1x10-2-0.4843-2x10-4 Potential, V SHE Current, A Potential, V SHE Current, A...
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- Fall '09
- Electrochemistry, corrosion rate