Iron(II) ions catalyze the oxidation of luminol by H 2 O 2 . The intensity of the resulting…

Iron(II) ions catalyze the oxidation of luminol by H2O2.
The intensity of the resulting chemiluminescence has been shown to increase
linearly with iron (II) concentration from 10-10 to 1028 M. Exactly
1.00 mL of water was added to a 2.00-mL aliquot of an unknown Fe (II) solution,
followed by 2.00 mL of a dilute H2O2 solution and 1.00 mL
of an alkaline solution of luminol. The chemiluminescence from the mixture was
integrated over a 10.0-s period and found to be 12.7. To a second 2.00-mL
aliquot of the sample was added 1.00 mL of a 3.27  10-5
M Fe1II2 solution followed by the same volume of H2O2 and
luminol. The integrated intensity was 27.9. Find the concentration of Fe(II) in
the sample.

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