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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Question
Chapter 14, Problem 14.4QAP
Interpretation Introduction
Interpretation:
The sketch of the photometric titration curve for the titration of Iron(III) with
Concept introduction:
The photometric titration curve is the plot showing the relationship between the absorbance of the solution corrected for the particular volume changes versus the volume of the titrant present in the solution.
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The amount of chloride in a brine solution is determined by the Volhard method. 15 mL 0.1182 M standard AgNO3 solution was added to 10 mL of the solution. Excess silver was back titrated with 0.101 M standard KSCN solution and 2.38 mL KSCN was spent to reach the turning point where the red Fe (SCN) 2+ complex was formed. Which of the following is the chloride concentration in the brine solution in g / L? (Cl: 35.5 g / mol)
A. 5.44B. 8.63C. 2.89D. 7.89
A spectrophotometric method for the determination of Fe (II) is based on the measurement of the red-orange color of its complex with o-phenanthroline. The complex obeys Beer's law for Fe (II) concentrations lower than 9 ppm. It is known that a solution containing 0.100 ppm of Fe(II) in excess of o-phenanthroline produces an absorbance of 0.200 in a cuvette with 1.00 cm of optical path and that an unknown sample gives an absorbance of 0.470 under the same conditions,
Calculate:
a) The concentration of Fe in the unknown sample in moles/L and ppm.
b) The molar absorptivity coefficient of the complex.
Fact. Fe = 55.845
The amount of chloride in a brine solution is determined by the Volhard method. 15 mL 0.1182 M standard AgNO3 solution was added to 10 mL of the solution. Excess silver was back titrated with 0.101 M standard KSCN solution and 2.38 mL KSCN was spent to reach the turning point where the red Fe(SCN)2+ complex was formed. Which of the following is the chloride concentration in the brine solution in g / L? (Cl: 35.5 g / mol)
A) 5,44
B) 8,63
C) 2,89
D) 7,89
Chapter 14 Solutions
Principles of Instrumental Analysis
Ch. 14 - Prob. 14.1QAPCh. 14 - A 0.4740-g pesticide sample was decomposed by wet...Ch. 14 - Sketch a photometric titration curve for the...Ch. 14 - Prob. 14.4QAPCh. 14 - Prob. 14.5QAPCh. 14 - The accompanying data (1.00-cm cells) were...Ch. 14 - A 3.03-g petroleum specimen was decomposed by wet...Ch. 14 - Prob. 14.8QAPCh. 14 - Prob. 14.9QAPCh. 14 - The acid-base indicator HIn undergoes the...
Ch. 14 - Prob. 14.11QAPCh. 14 - Prob. 14.12QAPCh. 14 - Copper(II) forms a 1:1 complex with the organic...Ch. 14 - Aluminum forms a 1:1 complex with...Ch. 14 - Prob. 14.15QAPCh. 14 - Prob. 14.16QAPCh. 14 - Prob. 14.17QAPCh. 14 - Prob. 14.18QAPCh. 14 - Prob. 14.19QAPCh. 14 - Given the Information that...Ch. 14 - Prob. 14.21QAPCh. 14 - Mixing the chelating reagent B with Ni(II) forms...Ch. 14 - Prob. 14.23QAP
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