**Concentration of Manganese in Red Wine**This graph provides a standard addition plot for the quantification of manganese absorbance in a 2020 red wine from Illinois. On the graph, "Absorbance" is plotted on the y-axis, and "Manganese Concentration (ppm)" is on the x-axis.**Graph Details:**- The dots on the plot represent different sample measurements.- A trend line fitted to the data points is shown, with the equation: \( y = 0.1373x + 0.122 \).- The coefficient of determination, \( R^2 = 0.9986 \), indicates a very high correlation between manganese concentration and absorbance.**Experimental Setup:**- Samples were prepared using standard additions of 0, 2.5, 5, 7.5, and 10 mL of a 10 ppm manganese standard solution.- Each addition was made to a 25.00 mL volumetric flask already containing 10.00 mL of wine sample.- The first flask contained only the 10 mL wine sample topped up with 40 mL of purified water.**Objective:**- **Question A:** Calculate the concentration of manganese in the red wine (in ppm).

The linear regression equation for the Absorbance versus manganese concentration (ppm) graph is Y = 0.1373X + 0.122 Slope, m = 0.1373 Y-intercept, b = 0.122 The magnitude of the X-intercept gives the concentration of Mn in red wine. In order to calculate, X-intercept, we put Y = 0 0 = 0.1373X + 0.122 ⇒0.1373X = - 0.122⇒X =- 0.1220.1373⇒X = - 0.888565 magnitude of the X-intercept = 0.8885652 Hence concentration of Mn in the diluted wine sample = 0.8885652 ppm The flask contains 10 mL wine and 40 mL purified water. Hence this is a 5X dilution. Hence the concentration Mn in the original wine sample = 5*0.8885652 ppm = 4.44 ppm (Answer)

Science

Chemistry

Concentration of Manganese in Red Wine 0.6 y = 0.1373x + 0.122 R2 = 0.9986 0.5 0.4 0.3 0.2 0.1 0.5 1 1.5 2.5 3 3.5 Manganese Concentration (ppm) Standard addition plot for quantification of absorbance by Manganese in a 2020 red wine from Illinois is shown above. Samples were prepared using 0, 2.5, 5, 7.5, and 10 mL additions 10 ppm manganese standard to 25.00 mL volumetric flasks already containing 10.00 mL wine samples. The first flask only contained the 10 mL wine sample and 40 mL of purified water. A) Calculate the concentration of manganese in the red wine (in ppm). Absorbance

Concentration of Manganese in Red Wine 0.6 y = 0.1373x + 0.122 R2 = 0.9986 0.5 0.4 0.3 0.2 0.1 0.5 1 1.5 2.5 3 3.5 Manganese Concentration (ppm) Standard addition plot for quantification of absorbance by Manganese in a 2020 red wine from Illinois is shown above. Samples were prepared using 0, 2.5, 5, 7.5, and 10 mL additions 10 ppm manganese standard to 25.00 mL volumetric flasks already containing 10.00 mL wine samples. The first flask only contained the 10 mL wine sample and 40 mL of purified water. A) Calculate the concentration of manganese in the red wine (in ppm). Absorbance

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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