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Redox potentials, Cell Diagrams and EMF, Hydrogen and oxygen

Download notes https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0By8B8I_4a9FbNDkyYTBjNjktM2QyMC00ZTY0LWEzNGYtMmVmNGIxOTdlYzk2&hl=en_GB Redox potentials http://www.chemistry.jamesmungall.co.uk Chemistry Tutorial worked example aimed at A-level or International Baccalaureate standard. AIM We are learning to: ? write cell diagrams ? work out e.m.f. of a cell from Redox potentials ? combine half-equations to write an overall equation QUESTION Use the following data to write the cell diagram, work out the e.m.f. and write the overall equation for the reaction of a hydrogen-oxygen fuel cell in alkaline conditions. O2(g) + 4H+(aq) + 4e-- ? 2H2O(l) +1.23 O2(g) + 2H2O(l) + 4e-- ? 4OH--(aq) +0.40 2H+(aq) + 2e-- ? H2(g) 0.00 2H2O(l) + 2e-- ? 2OH--(aq) + H2(g) --0.83
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