B. The copper concentration in a contaminated salt sample was determined by flame atomic absorption spectrometry. In the analysis, a 10.00-g sample containing an analyte is transferred to a 250-ml volumetric flask and diluted to volume. A series of 10.0 mL of the diluted sample solution was pipetted into each of five 50.0-mL volumetric flasks. Various volumes of a standard containing 12.2 ppm Cu were added to the flasks, and the solutions were then diluted to volume. The corresponding absorbances of each of the solutions are given below: Unknown, mL 10.0 10.0 10.0 10.0 10.0 Standard, mL 0.0 10.0 20.0 30.0 40.0 Absorbance 0.201 0.292 0.378 0.467 0.554 Calculate the copper concentration (a) in the diluted sample solution expressed in ppm Cu, and (b) in the salt sample as percent copper (%Cu).

B. The copper concentration in a contaminated salt sample was determined by flame atomic absorption spectrometry. In the analysis, a 10.00-g sample containing an analyte is transferred to a 250-ml volumetric flask and diluted to volume. A series of 10.0 mL of the diluted sample solution was pipetted into each of five 50.0-mL volumetric flasks. Various volumes of a standard containing 12.2 ppm Cu were added to the flasks, and the solutions were then diluted to volume. The corresponding absorbances of each of the solutions are given below: Unknown, mL 10.0 10.0 10.0 10.0 10.0 Standard, mL 0.0 10.0 20.0 30.0 40.0 Absorbance 0.201 0.292 0.378 0.467 0.554 Calculate the copper concentration (a) in the diluted sample solution expressed in ppm Cu, and (b) in the salt sample as percent copper (%Cu).

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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Concept explainers

Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.

Question

B. The copper concentration in a contaminated salt sample was determined by flame atomic absorption
spectrometry. In the analysis, a 10.00-g sample containing an analyte is transferred to a 250-mL
volumetric flask and diluted to volume.
A series of 10.0 mL of the diluted sample solution was pipetted into each of five 50.0-mL volumetric
flasks. Various volumes of a standard containing 12.2 ppm Cu were added to the flasks, and the
solutions were then diluted to volume. The corresponding absorbances of each of the solutions are
given below:
Unknown, mL
10.0
10.0
10.0
10.0
10.0
Standard, mL
0.0
10.0
20.0
30.0
40.0
Absorbance
0.201
0.292
0.378
0.467
0.554
Calculate the copper concentration (a) in the diluted sample solution expressed in ppm Cu, and (b) in
the salt sample as percent copper (%Cu).

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