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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

    chemisttree

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    You were determining the unknown concentration of iron in the tablet and used an excess of the reagent to determine iron.
     
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