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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![A student obtained a sample impure ASA sample. He hydrolyzed
the ASA with NaOH and heated the mixture to produce the
salicylate dianion:
C6H4 (OCOCH3) (COOH) + 3OH- → C6H4 (0) (COO) + 2
H₂O + CH3COO
Next the student then acidified the mixture with FeCl3-KCI-HCI
solution to produce the magenta complex of
tetraaquosalicylatoiron (III) ion:
C6H4 (0) (COO) + H3O+
C6H4 (OH) (COO-) + H₂O
3+
C6H4 (OH) (COO) + Fe(H₂O) ³+ [C6H4 (O) (COO) Fe(H₂O)] ++ H₂O + H₂O*](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F951dd416-9e85-4ee1-823a-94d34d579e9a%2Fa39f7115-6fb2-414e-add3-217e8d663e85%2F8og8co_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A student obtained a sample impure ASA sample. He hydrolyzed
the ASA with NaOH and heated the mixture to produce the
salicylate dianion:
C6H4 (OCOCH3) (COOH) + 3OH- → C6H4 (0) (COO) + 2
H₂O + CH3COO
Next the student then acidified the mixture with FeCl3-KCI-HCI
solution to produce the magenta complex of
tetraaquosalicylatoiron (III) ion:
C6H4 (0) (COO) + H3O+
C6H4 (OH) (COO-) + H₂O
3+
C6H4 (OH) (COO) + Fe(H₂O) ³+ [C6H4 (O) (COO) Fe(H₂O)] ++ H₂O + H₂O*

Transcribed Image Text:The complex ion is sensitive to pH, therefore the solution was buffered to pH 1.90 to avoid
the formation of di- and tri-salicylate complex of iron (III).
Before the concentration could be determined through UV-Vis
spectroscopy, the student needs to know the wavelength of light
that was most absorbed by the complex ion in order to set the
spectrometer properly. The student calibrated the spectrometer
by setting the transmittance to 100 % with FeCl3-KCI-HCI solution
as reference. The data is as follows:
Wavelength
(nm)
580
570
560
550
540
535
530
525
520
510
500
490
Absorbance
0.119
0.198
0.203
0.215
0.220
0.228
0.240
0.255
0.247
0.216
0.199
0.073
a.) Construct the absorption spectra of tetraaquosalicylatoiron
(III) complex ion.
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