The copper in an aqueous sample was determined by atomic absorption flame spectrometry. First, 10.0 ml of the unknown were 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. Unknown (mL) Standard (mL) Absorbance 10.0 0.0 0.201 10.0 10.0 0.292 10.0 20.0 0.378 10.0 30.0 0.467 10.0 40.0 0.554 A. Plot absorbance as a function of the concentration of Cu standard after final dilution and determine the equation of the line and determine the x-intercept. Calculate the copper concentration in ppm Cu in the aqueous sample.

The copper in an aqueous sample was determined by atomic absorption flame spectrometry. First, 10.0 ml of the unknown were 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. Unknown (mL) Standard (mL) Absorbance 10.0 0.0 0.201 10.0 10.0 0.292 10.0 20.0 0.378 10.0 30.0 0.467 10.0 40.0 0.554 A. Plot absorbance as a function of the concentration of Cu standard after final dilution and determine the equation of the line and determine the x-intercept. Calculate the copper concentration in ppm Cu in the aqueous sample.

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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Question

Note: the graph should be absorbance as a function of the concentration of Cu standard after final dilution, not volume.

explain in detail.

The copper in an aqueous sample was determined by atomic absorption flame spectrometry. First, 10.0
ml of the unknown were 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.
Unknown (mL)
Standard (mL)
Absorbance
10.0
0.0
0.201
10.0
10.0
0.292
10.0
20.0
0.378
10.0
30.0
0.467
10.0
40.0
0.554
A. Plot absorbance as a function of the concentration of Cu standard after final dilution and
determine the equation of the line and determine the x-intercept. Calculate the copper
concentration in ppm Cu in the aqueous sample.

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