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: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter19: Complex Ions
Section: Chapter Questions
Problem 46QAP
Related questions
Question
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)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff800a840-0309-4834-92a3-4244363b7afa%2F2a45303e-e208-4822-bfa8-19c4bc2b4cee%2Frp0c2yk_processed.png&w=3840&q=75)
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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff800a840-0309-4834-92a3-4244363b7afa%2F2a45303e-e208-4822-bfa8-19c4bc2b4cee%2Fotrxqyp_processed.jpeg&w=3840&q=75)
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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