The data shown below are Fe(II) concentrations observed at two different depths over an incubation period. They illustrate Fe(II) oxidation in the sediments that were incubated. a) Please calculate the first-order rate constants for Fe(II) oxidation at those two depths. b) please provide the half-life for dissolved Fe(II).
The data shown below are Fe(II) concentrations observed at two different depths over an incubation period. They illustrate Fe(II) oxidation in the sediments that were incubated. a) Please calculate the first-order rate constants for Fe(II) oxidation at those two depths. b) please provide the half-life for dissolved Fe(II).
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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The data shown below are Fe(II) concentrations observed at two different depths over an incubation period. They illustrate Fe(II) oxidation in the sediments that were incubated.
a) Please calculate the first-order rate constants for Fe(II) oxidation at those two depths.
b) please provide the half-life for dissolved Fe(II).
Transcribed Image Text:**Table: Change in Fe(II) Concentration Over Time at Different Depths**
This table represents the concentration of Fe(II) in millimolar (mM) at two different depths (0 cm and 45 cm) over a period of 28 days.
| Time (days) | Fe(II) (mM) at 0 cm | Fe(II) (mM) at 45 cm |
|-------------|---------------------|----------------------|
| 0.00 | 13.63 | 7.39 |
| 4.00 | 2.71 | 8.04 |
| 7.00 | 0.40 | 6.97 |
| 11.00 | 0.05 | 3.93 |
| 14.00 | 0.37 | 1.66 |
| 21.00 | 0.43 | 0.59 |
| 28.00 | 0.28 | 0.37 |
- **Observations**:
- At the initial time (0 days), Fe(II) concentration is higher at 0 cm compared to 45 cm.
- Over the 28-day period, Fe(II) concentration decreases at both depths.
- At 45 cm, Fe(II) concentration initially increases, peaks at day 4, then gradually decreases.
This data may be used to study the temporal changes in iron concentration at different soil or sediment depths over a period of time.
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