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Fundamentals Of Analytical Chemistry

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter16: Applications Of Neutralization Titrations

Section: Chapter Questions

Problem 16.40QAP

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i need help with 2 and 3, please show calculations

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D. Unknown Metal Ion Concentration
1. Prepare the unknown. Describe the preparation for the solution containing the unknown concentration of the
metal ion.
pipet 20mL of unknown sample into a 25mL volumetric flask. Add
1 to 2mL of concentrated NH3. Dilute to 25mL mark with .01M HNO3. Agitate.
Volume of unknown sample solution (mL)
20
Volume of diluted sample (mL)
25
2. Concentration of metal ion. Absorbance of metal ion in solution
0.316
0.084
Concentration of metal ion from the calibration curve (mol/L)
Concentration of metal ion in the original sample corrected for dilution (mol/L)
Show your calculations to account for the dilution of the original sample.
3. Expressing Concentration. Express the concentration of the metal ion in the sample in appropriate units of mass/
volume [i.e., pph (percent), ppm, ppb, etc.].
Concentration of metal ion in the original sample (mass/volume)
Show calculations.
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