Principles of Instrumental Analysis, 6th Edition
6th Edition
ISBN: 9788131525579
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cenage Learning
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Chapter 14, Problem 14.6QAP
The accompanying data (1.00-cm cells) were obtained for the spectrophotometric titration 10.00 mL of Pd(II) with 2.44 × 10-4 M Nitroso R(O. W Rollins and M. M. Oldham, Anal. chem .,1971, 43, 262, DOI: 10.1021/ac60297a026).
Calculate the concentration of the Pd(II) solution, given that the ligand-to-cation ratio in the colored product is 2:1
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A controversy broke out as a dead body was found in a bar on Cornelia Street. The media
revealed that minutes before the person died, he described his drink as something stronger
than other drinks in the bar. You were the analyst tasked to verify the cause of death.
Preliminary qualitative tests showed the possible presence of cyanide in the victim's death.
Thus, you tried to quantitatively detect cyanide ions in the victim's drink using
spectrophotometric analysis.
Standard solutions were of different CN- concentrations were made as shown in Table 2.
A 25.0mL aliquot of each standard solution was added with Fe(NO3)3 to form the colored
complex, [Fe(CN)6]³ (aq). Each standard solution was then diluted to a total volume of
50.0 mL. The absorbances of the diluted standard solutions were recorded using 1.00-cm
cells and at Amax = 725 nm and found in Table 2.
Table 2. Raw absorbance measurements for each standard solution of CN-.
[CN-] prior to dilution, M
Abs@725nm
0.002
0.000
0.040
0.160…
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
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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
Tooth enamel consists mainly of the mineral calcium hydroxyapatite, Can(PO)(OH). Trace elements in teeth of archeological specimens provide
anthropologists with clues about diet and disease of ancient people. Students at Hamline University measured the trace element strontium in
cnamel from extract wisdom teeth by atomic absorption spectroscopy. Solutions were prepared with a constant total volume of 10.0mL.
containing 0.750mg dissolved tooth enamel plus variable concentration of added Sr.
\table[[Added Sr (ng/mL- ppb), Signal (arbitrary units)], [0, 28.0], [2.50, 34.3], [5.00, 42.8], [7.50, 51.5], [10.00, 58.6]]
a) Prepare a graph to find the concentration of Sr in the 10mL sample solution in part per billion = n
m
L. (2%)
b) Find the concentration of Sr in tooth enamel in part per million = μ (3%)
5. Tooth enamel consists mainly of the mineral calcium hydroxyapatite, Ca(PO)(OH). Trace elements
in teeth of archeological specimens provide anthropologists with clues about diet and…
Chapter 14 Solutions
Principles of Instrumental Analysis, 6th Edition
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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