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Which one is reducing and which is oxidising?

  1. May 24, 2010 #1
    When a question with two half equations set out like below, how do I tell which one is oxidising and which one is reducing? Do I have to apply the standard reduction potentials table?

    Co2+ + 2e- -> CO (s)
    Ag+ +e- -> Ag (s)

    Thank you.
  2. jcsd
  3. May 25, 2010 #2
    Remember, lose electrons oxidized, gain electrons reduced
  4. May 25, 2010 #3
    And as a memory aid:

    OIL. RIG

    Oxidation Is Loss. Reduction Is Gain (of electrons)
  5. May 25, 2010 #4


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    Staff: Mentor

    Assuming you were asked to say what will happen if both half cells are present - yes.

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