in a standard addition calibration method, 50.0 ml volumetric flasks were used. A 5.0 ml aliquot of a solution containing penobarbital was put in each. The solutions were made basic with KOH and mixed with different increments of 2.0 ppm standard penobarbital. The volumes were adjusted to 50,0 ml and absorbances were measured as follows Volume added (ml) 0.00 0.50 1.00 1.50 2.00 Absorbance 0.33 0.48 0.64 0.80 0.96 Calculate the concentration of phenobarbital in the unknown (Use graphical or numerical solutions)

in a standard addition calibration method, 50.0 ml volumetric flasks were used. A 5.0 ml aliquot of a solution containing penobarbital was put in each. The solutions were made basic with KOH and mixed with different increments of 2.0 ppm standard penobarbital. The volumes were adjusted to 50,0 ml and absorbances were measured as follows Volume added (ml) 0.00 0.50 1.00 1.50 2.00 Absorbance 0.33 0.48 0.64 0.80 0.96 Calculate the concentration of phenobarbital in the unknown (Use graphical or numerical solutions)

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

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

Question

in a standard addition calibration method, 50.0 ml volumetric flasks were used. A 5.0 ml aliquot of a solution containing penobarbital was put
in each. The solutions were made basic with KOH and mixed with different increments of 2.0 ppm standard penobarbital. The volumes were
adjusted to 50,0 ml and absorbances were measured as follows
0.00 0.50
1.00
Volume added (ml)
1.50 2.00
0.33
0.48 0.64
0.80 0.96
Absorbance
Calculate the concentration of phenobarbital in the unknown (Use graphical or numerical solutions)
Selected Answer:
2.000 ppm
0.410 ppm
Answers:
2.000 ppm
5.000 ppm
0.315 ppm

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