The following data were obtained from the spectrophotometric titration of Cu(II) and Ca(II) in an unknown solution. A 25.00 mL aliquot of the unknown was taken to which 50.0 mL of ethanolamine buffer and 25.0 mL of distilled water were added. The solution was then titrated with standard 0.2508 M EDTA solution. Plot the recorded data, absorbance against volume of EDTA in mL. Correct the absorbance for volume changes. Calculate the number of moles of Ca(II) and Cu(II) in the unknown sample. Vol of Titrant, mL Vol of Titrant, mL Abs Abs
The following data were obtained from the spectrophotometric titration of Cu(II) and Ca(II) in an unknown solution. A 25.00 mL aliquot of the unknown was taken to which 50.0 mL of ethanolamine buffer and 25.0 mL of distilled water were added. The solution was then titrated with standard 0.2508 M EDTA solution. Plot the recorded data, absorbance against volume of EDTA in mL. Correct the absorbance for volume changes. Calculate the number of moles of Ca(II) and Cu(II) in the unknown sample. Vol of Titrant, mL Vol of Titrant, mL Abs Abs
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter20: Molecular Spectroscopy And Photochemistry
Section: Chapter Questions
Problem 67CP
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Question
![The following data were obtained from the spectrophotometric titration of Cu(II) and Ca(II) in an
unknown solution. A 25.00 mL aliquot of the unknown was taken to which 50.0 mL of
ethanolamine buffer and 25.0 mL of distilled water were added. The solution was then titrated
with standard 0.2508 M EDTA solution. Plot the recorded data, absorbance against volume of
EDTA in mL. Correct the absorbance for volume changes. Calculate the number of moles of
Ca(II) and Cu(II) in the unknown sample.
Vol of
Titrant,
mL
Vol of
Titrant,
mL
Abs
Abs
0.0
0.416
12.5
0.886
2.0
0.415
13.0
0.923
4.0
0.409
13.5
0.958
6.0
0.416
14.0
0.979
8.0
0.535
14.5
0.969
10.0
0.690
15.0
0.971
11.0
0.770
15.5
0.964
12.0
0.840](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F59f24e27-f8f3-4a0a-b115-8c2b5997887b%2F7d54b8a2-87fd-4d10-8f0a-c049dedfc339%2F9uqbdzr_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The following data were obtained from the spectrophotometric titration of Cu(II) and Ca(II) in an
unknown solution. A 25.00 mL aliquot of the unknown was taken to which 50.0 mL of
ethanolamine buffer and 25.0 mL of distilled water were added. The solution was then titrated
with standard 0.2508 M EDTA solution. Plot the recorded data, absorbance against volume of
EDTA in mL. Correct the absorbance for volume changes. Calculate the number of moles of
Ca(II) and Cu(II) in the unknown sample.
Vol of
Titrant,
mL
Vol of
Titrant,
mL
Abs
Abs
0.0
0.416
12.5
0.886
2.0
0.415
13.0
0.923
4.0
0.409
13.5
0.958
6.0
0.416
14.0
0.979
8.0
0.535
14.5
0.969
10.0
0.690
15.0
0.971
11.0
0.770
15.5
0.964
12.0
0.840
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