Ch15(Part1).pptx - Chapter 15(Part 1 Electrode...

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Chapter 15 (Part 1)Electrode Measurements(with some Chapter 14 Electropotentials review)
Electrochemical Cells and Sign Conventions
Half-ReactionsAre all written as reductionsLine notationsalt bridgephase boundaryThe cell above:Zn(s) │ ZnCl2(aq) ‖ CuSO4│ Cu(s)Electrodes are shown to the extreme left and rightBy convention the anode is written to the left and the cathode to the rightDetermining electrode which is whichRequires knowledge of whether the type of cellElectrolytic (nonspontaneous reactions requiring electrical energy input) Galvanic (spontaneous reactions that produce an electrical energy output)Requires determining the half cell potentials
Standard Reduction Potentials, E°Can be found inHarris, D.C. Exploring Chemical Analysis,Appendix CBard, A.J. The Encyclopedia of Electrochemistry of the ElementsSearching the internet (this can be a waste of time for unusual species)Determined at standard conditionsEach dissolved substance is 1 M concetrationEach gas is a 1 bar pressureEach solid or liquid is in its standard stateUsually, but not specified, at 25 °CThese values are relative

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