Suppose that you follow the procedure and find the absorbance of the final solution to be 0.475.  What is the concentration of Fe (mg/L) in the final solution?

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Suppose that you follow the procedure and find the absorbance of the final solution to be 0.475.  What is the concentration of Fe (mg/L) in the final solution?

### Fe Calibration Curve

The graph shown is an iron (Fe) calibration curve used to determine the concentration of iron in a solution through its absorbance value. The x-axis represents the concentration of iron ([Fe]) in mg/L, while the y-axis represents the absorbance.

The plotted points on the graph indicate the absorbance readings at different known concentrations of iron. A trend line (dotted) is drawn through these points, indicating a linear relationship between the concentration of iron and its absorbance.

#### Key Features:

- **Equation of the Line:** The linear equation displayed is \( y = 0.1216x + 0.0189 \).
  - **Slope:** 0.1216, representing the change in absorbance per unit change in concentration.
  - **Y-intercept:** 0.0189, indicating the absorbance value when the concentration is zero.

- **R-squared Value:** \( R^2 = 0.996 \)
  - This statistic indicates the goodness of fit for the trend line, with a value close to 1 suggesting that the model explains the variability of the data points very well.

This calibration curve is typically used in analytical chemistry to determine unknown concentrations by comparing measured absorbance values to the curve.
Transcribed Image Text:### Fe Calibration Curve The graph shown is an iron (Fe) calibration curve used to determine the concentration of iron in a solution through its absorbance value. The x-axis represents the concentration of iron ([Fe]) in mg/L, while the y-axis represents the absorbance. The plotted points on the graph indicate the absorbance readings at different known concentrations of iron. A trend line (dotted) is drawn through these points, indicating a linear relationship between the concentration of iron and its absorbance. #### Key Features: - **Equation of the Line:** The linear equation displayed is \( y = 0.1216x + 0.0189 \). - **Slope:** 0.1216, representing the change in absorbance per unit change in concentration. - **Y-intercept:** 0.0189, indicating the absorbance value when the concentration is zero. - **R-squared Value:** \( R^2 = 0.996 \) - This statistic indicates the goodness of fit for the trend line, with a value close to 1 suggesting that the model explains the variability of the data points very well. This calibration curve is typically used in analytical chemistry to determine unknown concentrations by comparing measured absorbance values to the curve.
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