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Homework Help: Simple redox question

  1. May 19, 2009 #1
    1. The problem statement, all variables and given/known data

    hey guys this question looks easy, but im confused? any help/tips would be appreciated
    Which of the following is the best reducing agent?

    Cl2 + 2e- 2Cl-; E° = 1.36 V
    Mg2+ + 2e- Mg; E° = -2.37 V
    2H+ + 2e- H2; E° = 0.00 V

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. May 19, 2009 #2


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    Homework Helper
    Education Advisor
    Gold Member

    You listed reaction half cells showing consumtion of electrons. What you want then is which half cell when written as a supplier of electrons would have the largest positive value?
  4. May 19, 2009 #3
    woudl that be mg? cuase when ya flip you change the sign?
  5. May 19, 2009 #4


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    Staff: Mentor

    Obviously it has something to do with standard potentials listed, isn't it? So the real question is, do you need high or low potential for reduction... Is chlorine an oxidizing, or reducing agent? Once you will know answer, you will know which end of the scale is which.
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