Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Electrochemistry question

  1. Mar 31, 2007 #1
    What is the different between spontaneous reduction and spontaneous oxidation? For spontaneous reduction you need to have Ecell to be (+), then what about spontaneous oxidation?

  2. jcsd
  3. Mar 31, 2007 #2


    User Avatar
    Science Advisor

    The work done on the cell / by the cell is given as,
    ΔG = -nFE
    Where nF is used to determined the total charge passed into / out of the cell and E is the cell potential.
    If E is positive, ΔG is negative.
    If E is negative, ΔG is positive.

    The reaction is spontaneous (the cell does work) when ΔG is negative (E is positive).
    The reaction needs to be driven by an outside source (work done on the cell) when ΔG is positive (E is negative).
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook