CHM135H1 Lecture Notes - Lecture 37: S.H.E, Intensive And Extensive Properties, Electrochemistry

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CHM135: LECTURE 33 Electrochemistry
November 30, 2018 (Relevant Reading: Chemistry 2nd ed. McMurray/Fay/Robinson Ch. 18)
Active and Inactive Electrode
- Active electrode an active component in its half cell and is a reactant or product in the
overall reaction
- Inactive electrode provides a surface for the reaction and completes the circuit; it doesn’t
participate actively in the overall reaction
- Inactive electrodes are necessary when none of the reaction components can be used as an
electrode; inactive electrodes are usually unreactive substances such as graphite or platinum
- (Powerpoint, Slide 16)
Standard Reduction Potentials
- Electrons flow from the S.H.E. (anode) to the copper cathode
- The S.H.E. is a piece of platinum foil that is in contact with bubbles of H2(g) at 1 atm pressure and
with H+(aq) at 1 M concentrations
- (Powerpoint, Slide 17)
Calculating From Reduction Potentials
- cell = cat - an
- Half cell potentials are intensive properties
- Cathode is where reduction occurs so don’t reverse sign from value in table; anode is where
oxidation occurs so do reverse sign from value in table
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