A 5.07-g petroleum specimen was decomposed by wet ashing and subsequently diluted to 500. mL in a volumetric flask. Cobalt was determined by treating 25.00-mL aliquots of this diluted solution as follows:Reagent Volume in mL Co(II), 3.00 ppm Ligand H2O Absorbance 0.0020.005.000.4165.0020.000.000.522 Assume that the /ligand chelate obeys Beer’s law and calculate the percentage of cobalt in the original sample.

The relationship between absorbance (A), molar absorptivity, molar analytical concentration (c) of…

Answered: 5.07-g petroleum specimen was…

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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A 5.07-g petroleum specimen was decomposed by wet ashing and subsequently diluted to 500. mL in a volumetric flask. Cobalt was determined by treating 25.00-mL aliquots of this diluted solution as follows:

Reagent Volume in mL

Co(II), 3.00 ppm	Ligand	H2O	Absorbance

0.00	20.00	5.00	0.416
5.00	20.00	0.00	0.522

Assume that the /ligand chelate obeys Beer’s law and calculate the percentage of cobalt in the original sample.

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