Principles of Instrumental Analysis
7th Edition
ISBN: 9781337468039
Author: Skoog
Publisher: Cengage
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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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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
A solution of Ba(OH)2 was standardized against0.1215 g of primary-standard-grade benzoic acid, C6H5COOH (122.12 g/mol). An end point was observedafter addition of 43.25 mL of base.
(a) Calculate the molar concentration of the base.
(b) Calculate the standard deviation of the molarconcentration if the standard deviation for themass measurement was ±0.3 mg and that for thevolume measurement was ±0.02 mL.
(c) Assuming an error of ±0.3 mg in the mass measurement,calculate the absolute and relative systematicerror in the molar concentration.
The following data are obtained from three standard soltions using UV-Vis spectroscopy:
What is the colar concentration (M) of an unknown solution with an absorbance of 0.180 at 255 nm? The unknown solution contains the same analyte as the standard solution does. The molar mass of the analyte is 188.65 g/mol
a) 4.82x10-5b)1.9x10-3c)3.60x10-4d)1.9x10-5e)1.8x 10-4
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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