Derive an expression relating absorbance to the concentrations of standard and unknown ( c subscript s and c subscript x) and the volumes of the standards and unknown ( V subscript s and V subscript x ) as well as the volume to which the solutions were diluted (V subscript t). Derive expressions for the slope and the intercept of the straight line obtained in (a) in terms of the variables listed above. 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 wereadded to the flasks, and the solutions were then diluted to volume.Unknown, mL Standard, mL Absorbance0.00.20110.00.29220.00.37830.00.46740.00.55410.010.010.010.010.0

Volume of the solution = 10 mLVolume and absorbance data of an aqueous solution is given.

Answered: Derive an expression relating…

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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Derive an expression relating absorbance to the concentrations of standard and unknown ( c subscript s and c subscript x) and the volumes of the standards and unknown ( V subscript s and V subscript x ) as well as the volume to which the solutions were diluted (V subscript t). Derive expressions for the slope and the intercept of the straight line obtained in (a) in terms of the variables listed above.

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
0.0
0.201
10.0
0.292
20.0
0.378
30.0
0.467
40.0
0.554
10.0
10.0
10.0
10.0
10.0

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