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Iron 0-phenanthroline complex

  • Thread starter corinnab
  • Start date
9
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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!
 

Answers and Replies

9
0
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:
chemisttree
Science Advisor
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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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