**Analysis of Fe³⁺ Content in Jordan Lake Water**To determine the Fe³⁺ concentration in Jordan Lake, a 20.0-mL water sample was acidified with nitric acid and treated with excess KSCN to form a red complex (KSCN is colorless on its own). The solution was then diluted to 50.0 mL and its absorbance was measured at 0.345 in a cell with a 1.00 cm path length.For comparison, a 5.0-mL reference sample containing 4.80 x 10⁻⁴ M Fe³⁺ was also treated with HNO₃ and KSCN, diluted to 50.0 mL, and produced an absorbance of 0.512 in the same cell.**Question:** What is the concentration of Fe³⁺ in Jordan Lake?**Answer Choices:**- A. 9.16 x 10⁻⁴ M- B. 4.58 x 10⁻⁵ M- C. 6.80 x 10⁻⁵ M- D. 2.29 x 10⁻⁵ M- E. 1.14 x 10⁻⁴ M- F. 8.09 x 10⁻⁵ M- G. 1.77 x 10⁻⁴ M- H. 8.46 x 10⁻⁴ MNo graphs or diagrams are included in this analysis.

First, we have to calculate the value of the molar absorptivity constant, ε using the concentration…

Water from Jordan Lake was analyzed for its Fe³+ content. A 20.0-mL sample of lake water was acidified with nitric acid and treated with excess KSCN to form a red complex (KSCN itself is colorless). The solution was then diluted to 50.0-mL and put in a 1.00 cm pathlength cell, where it yielded an absorbance of 0.345. For comparison, a 5.0-mL reference sample of 4.80 x 10 4 M Fe³+ was treated with HNO3 and KSCN and diluted to 50.0 mL. The reference solution was also placed in a 1.00-cm cell and gave an absorbance of 0.512. What is the concentration of Fe³+ in Jordan Lake? A. 9.16 x 10-4 M B. 4.58 x 10-5 M C. 6.80 x 10-5 M D. 2.29 x 10-5 M E. 1.14 x 10-4 M F. 8.09 x 10-5 M G. 1.77 x 10-4 M OH. 8.46 x 10-4 M

Water from Jordan Lake was analyzed for its Fe³+ content. A 20.0-mL sample of lake water was acidified with nitric acid and treated with excess KSCN to form a red complex (KSCN itself is colorless). The solution was then diluted to 50.0-mL and put in a 1.00 cm pathlength cell, where it yielded an absorbance of 0.345. For comparison, a 5.0-mL reference sample of 4.80 x 10 4 M Fe³+ was treated with HNO3 and KSCN and diluted to 50.0 mL. The reference solution was also placed in a 1.00-cm cell and gave an absorbance of 0.512. What is the concentration of Fe³+ in Jordan Lake? A. 9.16 x 10-4 M B. 4.58 x 10-5 M C. 6.80 x 10-5 M D. 2.29 x 10-5 M E. 1.14 x 10-4 M F. 8.09 x 10-5 M G. 1.77 x 10-4 M OH. 8.46 x 10-4 M

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.

Question

**Analysis of Fe³⁺ Content in Jordan Lake Water**

To determine the Fe³⁺ concentration in Jordan Lake, a 20.0-mL water sample was acidified with nitric acid and treated with excess KSCN to form a red complex (KSCN is colorless on its own). The solution was then diluted to 50.0 mL and its absorbance was measured at 0.345 in a cell with a 1.00 cm path length.

For comparison, a 5.0-mL reference sample containing 4.80 x 10⁻⁴ M Fe³⁺ was also treated with HNO₃ and KSCN, diluted to 50.0 mL, and produced an absorbance of 0.512 in the same cell.

**Question:** What is the concentration of Fe³⁺ in Jordan Lake?

**Answer Choices:**
- A. 9.16 x 10⁻⁴ M
- B. 4.58 x 10⁻⁵ M
- C. 6.80 x 10⁻⁵ M
- D. 2.29 x 10⁻⁵ M
- E. 1.14 x 10⁻⁴ M
- F. 8.09 x 10⁻⁵ M
- G. 1.77 x 10⁻⁴ M
- H. 8.46 x 10⁻⁴ M

No graphs or diagrams are included in this analysis.

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