Fe* is used as a catalyst for the oxidation of luminal by H,02. The resulting chemiluminescence increases linearly with Fet concentration. Exactly 1.0 mL of water was added to a 5.0-mL sample of an unknown Fe2* solution, followed by 2.0 mL of H20, and 1.0 mL of luminol. The chemiluminescence intensity was found to be 16.1. When 1.0 mL of 4.75 x 10 5M Fe2+ solution was added to another 5.0-mL of the unknown Fe2+ solution, followed by 2.0 mL of H202 and 1.0 mL of luminol, the chemiluminescence intensity was 39.6. Calculate the concentration of iron ions in the sample. 6.5 x 106 M 9.0 x 10 5 M O 1.4x 10 5 M 1.3 x 104 M 1.6 x 104 M

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Fe2+ is used as a catalyst for the oxidation of luminal by H,02. The resulting chemiluminescence increases linearly with Fe2* concentration.
Exactly 1.0 mL of water was added to a 5.0-mL sample of an unknown Fe2* solution, followed by 2.0 mL of H20, and 1.0 mL of luminol. The
chemiluminescence intensity was found to be 16.1.
When 1.0 mL of 4.75 x 10 SM Fe2+ solution was added to another 5.0-mL of the unknown Fe2+ solution, followed by 2.0 mL of H,0, and 1.0
mL of luminol, the chemiluminescence intensity was 39.6.
Calculate the concentration of iron ions in the sample.
O 6.5 x 106 M
9.0 x 10 5 M
1.4 x 10 5 M
1.3 x 104 M
1.6 x 104 M
Transcribed Image Text:Fe2+ is used as a catalyst for the oxidation of luminal by H,02. The resulting chemiluminescence increases linearly with Fe2* concentration. Exactly 1.0 mL of water was added to a 5.0-mL sample of an unknown Fe2* solution, followed by 2.0 mL of H20, and 1.0 mL of luminol. The chemiluminescence intensity was found to be 16.1. When 1.0 mL of 4.75 x 10 SM Fe2+ solution was added to another 5.0-mL of the unknown Fe2+ solution, followed by 2.0 mL of H,0, and 1.0 mL of luminol, the chemiluminescence intensity was 39.6. Calculate the concentration of iron ions in the sample. O 6.5 x 106 M 9.0 x 10 5 M 1.4 x 10 5 M 1.3 x 104 M 1.6 x 104 M
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