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4. The %Mn in steel can also be determined spectrophotometrically by oxidizing the manganese to the intensely colored permanganate, MnO4. Standard solutions of permanganate gave the following absorbances (in a 1 cm cell): ABSORBANCE CONC. OF MnO4 (g/mL) 1.05 x 10-5 0.210 0.315 0.429 0.599 0.801 1.61 x 10-5 0.5886 0.3498 0.4555 2.21 x 10-5 2.98 x 10-5 4.04 x 10-5 The following samples of steel were thoroughly reacted to convert the manganese into permanganate and then diluted to 500.00 mL. WT. OF STEEL (g) gud atstattet. (00mL ho val pipil ABSORBANCE 0.611 0.359 0.482 Again, using Excel, plot the calibration data and calculate the %Mn in the steel. Print and attach the calibration curve and present your calculations. hodinkon

4. The %Mn in steel can also be determined spectrophotometrically by oxidizing the manganese to the intensely colored permanganate, MnO4. Standard solutions of permanganate gave the following absorbances (in a 1 cm cell): ABSORBANCE CONC. OF MnO4 (g/mL) 1.05 x 10-5 0.210 0.315 0.429 0.599 0.801 1.61 x 10-5 0.5886 0.3498 0.4555 2.21 x 10-5 2.98 x 10-5 4.04 x 10-5 The following samples of steel were thoroughly reacted to convert the manganese into permanganate and then diluted to 500.00 mL. WT. OF STEEL (g) gud atstattet. (00mL ho val pipil ABSORBANCE 0.611 0.359 0.482 Again, using Excel, plot the calibration data and calculate the %Mn in the steel. Print and attach the calibration curve and present your calculations. hodinkon

Chemistry
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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How would I solve Problem 4? I have the excel graph as provided.

 

Need to get the %Mn

 

I have some small idea but think is wrong... would be...

%Mn = 500mL * 1molMn/ g MnO4 * 1molMn/1molMnO4- * gMn/1molMn * 100%/SampleMassg

Part 4 Conc. (g/mL) 0.0000105 0.0000161 0.0000221 0.0000298 0.0000404 Absorbance 0.21 0.315 0.429 0.599 0.801 Absorbance 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 Calibrants y = 19,958.8107x -0.0038 R² 0.9993 0.00001 0.00002 0.00003 0.00004 0.00005 FAS Concentration (abscissa) (Part 2) Q4 Calibrants Linear (Calibrants)
Transcribed Image Text:Part 4 Conc. (g/mL) 0.0000105 0.0000161 0.0000221 0.0000298 0.0000404 Absorbance 0.21 0.315 0.429 0.599 0.801 Absorbance 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 Calibrants y = 19,958.8107x -0.0038 R² 0.9993 0.00001 0.00002 0.00003 0.00004 0.00005 FAS Concentration (abscissa) (Part 2) Q4 Calibrants Linear (Calibrants)
3. Why is it necessary to buffer the solution with sodium acetate? Be specific. 4. The %Mn in steel can also be determined spectrophotometrically by oxidizing the manganese to the intensely colored permanganate, MnO4. Standard solutions of permanganate gave the following absorbances (in a 1 cm cell): ABSORBANCE CONC. OF MnO4 (g/mL) 1.05 x 10-5 0.210 0.315 0.429 0.599 0.801 1.61 x 10-5 0.5886 0.3498 0.4555 2.21 x 10-5 2.98 x 10-5 4.04 x 10-5 The following samples of steel were thoroughly reacted to convert the manganese into permanganate and then diluted to 500.00 mL. WT. OF STEEL (g) ABSORBANCE 0.611 0.359 0.482 god at start stel 100 (00m² ho vai pipitt nodivlen Again, using Excel, plot the calibration data and calculate the %Mn in the steel. Print and attach the calibration curve and present your calculations. -5.5 0.0038 8.36 0.34² I met M X I no
Transcribed Image Text:3. Why is it necessary to buffer the solution with sodium acetate? Be specific. 4. The %Mn in steel can also be determined spectrophotometrically by oxidizing the manganese to the intensely colored permanganate, MnO4. Standard solutions of permanganate gave the following absorbances (in a 1 cm cell): ABSORBANCE CONC. OF MnO4 (g/mL) 1.05 x 10-5 0.210 0.315 0.429 0.599 0.801 1.61 x 10-5 0.5886 0.3498 0.4555 2.21 x 10-5 2.98 x 10-5 4.04 x 10-5 The following samples of steel were thoroughly reacted to convert the manganese into permanganate and then diluted to 500.00 mL. WT. OF STEEL (g) ABSORBANCE 0.611 0.359 0.482 god at start stel 100 (00m² ho vai pipitt nodivlen Again, using Excel, plot the calibration data and calculate the %Mn in the steel. Print and attach the calibration curve and present your calculations. -5.5 0.0038 8.36 0.34² I met M X I no
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