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: Iron 0-phenanthroline complex

  1. Apr 22, 2008 #1
    1. This is a question about a lab.
    The absorbing solution used in the lab had a mole ratio of phen to Fe of 52.8:1
    However, the complex [Fe(phen)3]2+ has a mole ratio of 3:1 for phen:Fe

    [Fe(phen)3]2+ is a coloured complex and we were determing iron concentration in a tablet.

    I don't understand why we used a solution with such a high mole ratio, would appreciate any help!
  2. jcsd
  3. Apr 23, 2008 #2
    EDIT: the ratio in the absorbing solution is 5.2:1 I made a mistake
    So what i would like to know is why the excess 0-phenanthroline in the absorbing solution?
    Last edited: Apr 23, 2008
  4. Apr 23, 2008 #3


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    You were determining the unknown concentration of iron in the tablet and used an excess of the reagent to determine iron.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook