Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter 13, Problem 13.22QAP
Interpretation Introduction
Interpretation:
Using the given values, absorbance and transmittance should be calculated. To derive the spectrum of the compound the graph between wavelength and absorbance should be constructed.
Concept introduction:
Diode array spectrophotometer is used for instrumental analysis. As it is composed with a single detector, the instrument is capable of monitoring one wavelength at a time. Diode array spectrophotometer is very fast in data acquisition, which allows building up multiple spectra for a single sample. The final spectrum is presented as an average of individual samples.
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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*
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*
. A solution containing the complex formed between two substances has a molar absorptivity of 9.32 X 103 L mol-1 cm-1 at 470 nm.
a)What is the absorbance of a 6.24x10-5 M solution of the complex at 470 nm in a 1.00 cm cell?
b)What is the percent transmittance of the solution described in (a)?
c)What is the molar concentration of the complex in a solution that has the absorbance described in (a) when measured at 470 nm in a 5.00 cm cell
. A solution containing the complex formed between two substances has a molar absorptivity of 9.32 X 103 L mol-1 cm-1 at 470 nm.
a)What is the absorbance of a 6.24x10-5 M solution of the complex at 470 nm in a 1.00 cm cell?
b)What is the percent transmittance of the solution described in (a)?
c)What is the molar concentration of the complex in a solution that has the absorbance described in (a) when measured at 470 nm in a 5.00 cm cell
Chapter 13 Solutions
Principles of Instrumental Analysis
Ch. 13 - Prob. 13.1QAPCh. 13 - Prob. 13.2QAPCh. 13 - Prob. 13.3QAPCh. 13 - Prob. 13.4QAPCh. 13 - Prob. 13.5QAPCh. 13 - Prob. 13.6QAPCh. 13 - Prob. 13.7QAPCh. 13 - At 580 nm, which is the wavelength of its maximum...Ch. 13 - Prob. 13.9QAPCh. 13 - Zinc(II) and the ligand L form a 1:1 complex that...
Ch. 13 - The equilibrium constant for the conjugate...Ch. 13 - The equilibrium constant for the reaction...Ch. 13 - Prob. 13.13QAPCh. 13 - Prob. 13.14QAPCh. 13 - Prob. 13.15QAPCh. 13 - Prob. 13.16QAPCh. 13 - Prob. 13.17QAPCh. 13 - Prob. 13.18QAPCh. 13 - Prob. 13.19QAPCh. 13 - Prob. 13.20QAPCh. 13 - Prob. 13.21QAPCh. 13 - Prob. 13.22QAPCh. 13 - Prob. 13.23QAPCh. 13 - Prob. 13.24QAPCh. 13 - Prob. 13.25QAPCh. 13 - Prob. 13.26QAPCh. 13 - Prob. 13.27QAP
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