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student prepared a solution that had 5.00 mL 0.002 M iron(III) nitrate in 1 M nitric acid, 3.00 mL 0.002 M potassium thiocyanate, and 2.00 mL DI water. Using the standard curve above, if the absorbance for the solution was 0.562, calculate the equilibrium constant, Keq.

student prepared a solution that had 5.00 mL 0.002 M iron(III) nitrate in 1 M nitric acid, 3.00 mL 0.002 M potassium thiocyanate, and 2.00 mL DI water. Using the standard curve above, if the absorbance for the solution was 0.562, calculate the equilibrium constant, Keq.

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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
Chapter1: Chemical Foundations
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A student prepared a solution that had 5.00 mL 0.002 M iron(III) nitrate in 1 M nitric acid, 3.00 mL 0.002 M potassium thiocyanate, and 2.00 mL DI water.

Using the standard curve above, if the absorbance for the solution was 0.562, calculate the equilibrium constant, Keq.

A student prepared a solution that had 5.00 mL 0.002 M iron(III) nitrate in 1 M nitric acid, 3.00 mL 0.002 M potassium thiocyanate, and 2.00 mL DI water. Using the standard curve above, if the absorbance for the solution was 0.562, calculate the equilibrium constant, Kₑq. *Note: If you set this up well in Excel, you can use the same spreadsheet in lab. Report your answer with zero places after the decimal.*
Transcribed Image Text:A student prepared a solution that had 5.00 mL 0.002 M iron(III) nitrate in 1 M nitric acid, 3.00 mL 0.002 M potassium thiocyanate, and 2.00 mL DI water. Using the standard curve above, if the absorbance for the solution was 0.562, calculate the equilibrium constant, Kₑq. *Note: If you set this up well in Excel, you can use the same spreadsheet in lab. Report your answer with zero places after the decimal.*
The graph illustrates the relationship between the absorbance of FeSCN²⁺ at 447 nm and its concentration. ### Key Elements of the Graph: - **Title**: "Absorbance of FeSCN²⁺ as a Function of its Concentration." - **Axes**: - The x-axis represents the concentration of FeSCN²⁺ ions in molarity (M), ranging from 5.00E-05 to 3.00E-04. - The y-axis represents the absorbance at 447 nm, ranging from 0.300 to 1.000. - **Data Points**: The graph shows a series of data points plotted along a straight line, indicating a positive correlation between concentration and absorbance. - **Trendline Equation**: The linear equation is given as \( y = 3506.2x + 0.0421 \). This equation describes the relationship between the concentration (x) and absorbance (y), where the slope is 3506.2 and the y-intercept is 0.0421. - **R² Value**: The coefficient of determination, \( R² = 0.9978 \), suggests a very strong positive correlation, indicating that over 99% of the variance in absorbance can be explained by the concentration of FeSCN²⁺. This graph is useful for understanding how FeSCN²⁺ concentration affects its absorbance, which can be essential in analytical chemistry for determining unknown concentrations.
Transcribed Image Text:The graph illustrates the relationship between the absorbance of FeSCN²⁺ at 447 nm and its concentration. ### Key Elements of the Graph: - **Title**: "Absorbance of FeSCN²⁺ as a Function of its Concentration." - **Axes**: - The x-axis represents the concentration of FeSCN²⁺ ions in molarity (M), ranging from 5.00E-05 to 3.00E-04. - The y-axis represents the absorbance at 447 nm, ranging from 0.300 to 1.000. - **Data Points**: The graph shows a series of data points plotted along a straight line, indicating a positive correlation between concentration and absorbance. - **Trendline Equation**: The linear equation is given as \( y = 3506.2x + 0.0421 \). This equation describes the relationship between the concentration (x) and absorbance (y), where the slope is 3506.2 and the y-intercept is 0.0421. - **R² Value**: The coefficient of determination, \( R² = 0.9978 \), suggests a very strong positive correlation, indicating that over 99% of the variance in absorbance can be explained by the concentration of FeSCN²⁺. This graph is useful for understanding how FeSCN²⁺ concentration affects its absorbance, which can be essential in analytical chemistry for determining unknown concentrations.
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