Conclusion 5: You are tasked with analyzing a suspiciously pink sample of drinking water to establish if it has unsavory levels of MnO4-contamination. It has an absorbance of 0.83 at 544 nm when measured in a cuvette that is 1 cm across. Using the equation of your trend line from Plot 4, determine the concentration of KMnO4 in moles/liter. Convert this concentration to grams of manganese/liter and compare it to the EPA guideline above. Trandline is Absorbtion = 2000(Concentration KMnO4) (Y=Mx)
Conclusion 5: You are tasked with analyzing a suspiciously pink sample of drinking water to establish if it has unsavory levels of MnO4-contamination. It has an absorbance of 0.83 at 544 nm when measured in a cuvette that is 1 cm across. Using the equation of your trend line from Plot 4, determine the concentration of KMnO4 in moles/liter. Convert this concentration to grams of manganese/liter and compare it to the EPA guideline above. Trandline is Absorbtion = 2000(Concentration KMnO4) (Y=Mx)
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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Conclusion 5: You are tasked with analyzing a suspiciously pink sample of drinking water to establish if it has unsavory levels of MnO4-contamination. It has an absorbance of 0.83 at 544 nm when measured in a cuvette that is 1 cm across.
- Using the equation of your trend line from Plot 4, determine the concentration of KMnO4 in moles/liter.
Convert this concentration to grams of manganese/liter and compare it to the EPA guideline above.
Trandline is Absorbtion = 2000(Concentration KMnO4) (Y=Mx)
Transcribed Image Text:**Conclusion 5:** You are tasked with analyzing a suspiciously pink sample of drinking water to establish if it has unsavory levels of MnO₄⁻ contamination. It has an absorbance of 0.83 at 544 nm when measured in a cuvette that is 1 cm across.
a) Using the equation of your trend line from *Plot 4*, determine the concentration of KMnO₄ in moles/liter.
b) Convert this concentration to grams of manganese/liter and compare it to the EPA guideline above.
![**Title: Absorbance as a Function of Concentration of KMnO₄ at 544 nm**
**Graph Explanation:**
This chart illustrates the relationship between the absorbance and concentration of potassium permanganate (KMnO₄) at a wavelength of 544 nm.
- **X-axis:** Represents the concentration of KMnO₄ in molarity (M), ranging from 0 to 0.0009 M.
- **Y-axis:** Represents the absorbance, ranging from 0 to 1.8.
**Data Points and Trend Line:**
- The graph includes five data points, plotted at various concentrations.
- A dotted trend line runs through the points, indicating a linear relationship between concentration and absorbance.
**Equation and Correlation:**
- The linear equation displayed on the graph: \( A = 2000 \times [\text{KMnO₄}] \)
- This implies that the absorbance (A) is directly proportional to the concentration of KMnO₄, with a proportionality constant of 2000.
- The correlation coefficient \( R^2 = 1 \) suggests a perfect linear correlation.
**Conclusion:**
The graph clearly demonstrates that as the concentration of KMnO₄ increases, the absorbance at 544 nm also increases linearly, confirming the direct proportionality indicated by Beer-Lambert’s law. This relationship is crucial for spectrophotometric analysis, allowing for the determination of unknown concentrations.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7c3d39fb-edac-4deb-a456-8fd5dbb0e228%2Ff52b576d-55a0-481a-a31b-8c3246cab3ea%2Fmt3dhri_processed.png&w=3840&q=75)
Transcribed Image Text:**Title: Absorbance as a Function of Concentration of KMnO₄ at 544 nm**
**Graph Explanation:**
This chart illustrates the relationship between the absorbance and concentration of potassium permanganate (KMnO₄) at a wavelength of 544 nm.
- **X-axis:** Represents the concentration of KMnO₄ in molarity (M), ranging from 0 to 0.0009 M.
- **Y-axis:** Represents the absorbance, ranging from 0 to 1.8.
**Data Points and Trend Line:**
- The graph includes five data points, plotted at various concentrations.
- A dotted trend line runs through the points, indicating a linear relationship between concentration and absorbance.
**Equation and Correlation:**
- The linear equation displayed on the graph: \( A = 2000 \times [\text{KMnO₄}] \)
- This implies that the absorbance (A) is directly proportional to the concentration of KMnO₄, with a proportionality constant of 2000.
- The correlation coefficient \( R^2 = 1 \) suggests a perfect linear correlation.
**Conclusion:**
The graph clearly demonstrates that as the concentration of KMnO₄ increases, the absorbance at 544 nm also increases linearly, confirming the direct proportionality indicated by Beer-Lambert’s law. This relationship is crucial for spectrophotometric analysis, allowing for the determination of unknown concentrations.
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