1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: Calculating ξ° value for a galvanic cell

  1. Nov 1, 2011 #1
    Calculate the ξ° value for the galvanic cell:
    IO3(aq) + Fe2+(aq) <--> Fe3+(aq) + I2(aq)

    So I found the half reactions to be:

    5Fe2+(aq) --> 5Fe3+(aq) + 5e- Reducing agent 0.77V
    6H+(aq) + 5Fe2+(aq) + 5e- --> I2(aq) + 3H2O Oxidizing agent

    The problem I have is that I can't find the standard reduction potential for the cation's half reaction. Do I just use the potential for I2(s) + 2e- --> 2I- or this something special that I'm missing?

    Thanks!
     
  2. jcsd
  3. Nov 2, 2011 #2

    Borek

    User Avatar

    Staff: Mentor

    ξ°? and not E0?

    IO3(aq)? and not IO3-?

    It can be difficult to not reduced iodine further to I- in the presence of Fe2+, but perhaps with right stoichiometry reaction will stop at I2.

    Why 5?

    This is completely off - please check if that's what you meant.

    Not surprising - reaction you wrote doesn't make sense.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook




Loading...