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You have a stock solution certified by a manufacturer to contain 250.0 ± 0.4 μg SO-/mL. You would like to dilute it by a factor of 100 to obtain 2.500 μg/mL. Two possible methods of dilution are stated. For each method, calculate the resulting absolute uncertainty in concentration. Use the manufacturer's tolerances in the table for uncertainties. Glassware 1-ml transfer pipet 10-mL transfer pipet 100-mL volumetric flask Tolerance ±0.006 mL. 10.02 mL +0.08 mL Method A: Dilute 10.00 mL up to 100 mL with a transfer pipet and volumetric flask. Then take 10.00 mL of the dilute solution and dilute it again to 100 mL.. absolute uncertainty: ± Method B: Dilute 1.000 mL up to 100 mL with a transfer pipet and volumetric flask. absolute uncertainty: ± µg/mL. μg/mL

You have a stock solution certified by a manufacturer to contain 250.0 ± 0.4 μg SO-/mL. You would like to dilute it by a factor of 100 to obtain 2.500 μg/mL. Two possible methods of dilution are stated. For each method, calculate the resulting absolute uncertainty in concentration. Use the manufacturer's tolerances in the table for uncertainties. Glassware 1-ml transfer pipet 10-mL transfer pipet 100-mL volumetric flask Tolerance ±0.006 mL. 10.02 mL +0.08 mL Method A: Dilute 10.00 mL up to 100 mL with a transfer pipet and volumetric flask. Then take 10.00 mL of the dilute solution and dilute it again to 100 mL.. absolute uncertainty: ± Method B: Dilute 1.000 mL up to 100 mL with a transfer pipet and volumetric flask. absolute uncertainty: ± µg/mL. μg/mL

Chemistry
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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You have a stock solution certified by a manufacturer to contain 250.0 + 0.4 pg SO -/mlL. You would like to dilute it by a factor of 100 to obtain 2.500 ug/mL. Two possible methods of dilution are stated. For each method, calculate the resulting absolute uncertainty in concentration. Use the manufacturer's tolerances in the table for uncertainties. Glassware Tolerance I-ml. transfer pipet +0.006 ml. 10-mL transfer pipet +0.02 ml 100-mL volumetric flask +0.08 mL Method A: Dilute 10.00 mL up to 100 mL with a transfer pipet and volumetric flask. Then take 10.00 mL of the dilute solution and dilute it again to 100 mL. absolute uncertainty: + ug/ml. Method B: Dilute 1.000 mL up to 100 mL with a transfer pipet and volumetric flask. absolute uncertainty: + ug/mL Why is one method more precise than the other? Method B is more precise because the absolute uncertainty in the l-ml pipet is 0.006 mL, which is smaller than the uncertainties of the other glassware. Method B is less precise because the absolute uncertainty in the 1-mL pipet is 0.006 ml., which is smaller than the uncertainties of the other glassware. Method B is less precise because the percent relative uncertainty in the 1-mL pipet is 0.6%, which is 3 times larger than the uncertaintics of the other glassware. O Method B is more precise because the percent relative uncertainty in the 1-mL pipet is 0.6%, which is 3 times larger than the uncertainties of the other glassware.
Transcribed Image Text:You have a stock solution certified by a manufacturer to contain 250.0 + 0.4 pg SO -/mlL. You would like to dilute it by a factor of 100 to obtain 2.500 ug/mL. Two possible methods of dilution are stated. For each method, calculate the resulting absolute uncertainty in concentration. Use the manufacturer's tolerances in the table for uncertainties. Glassware Tolerance I-ml. transfer pipet +0.006 ml. 10-mL transfer pipet +0.02 ml 100-mL volumetric flask +0.08 mL Method A: Dilute 10.00 mL up to 100 mL with a transfer pipet and volumetric flask. Then take 10.00 mL of the dilute solution and dilute it again to 100 mL. absolute uncertainty: + ug/ml. Method B: Dilute 1.000 mL up to 100 mL with a transfer pipet and volumetric flask. absolute uncertainty: + ug/mL Why is one method more precise than the other? Method B is more precise because the absolute uncertainty in the l-ml pipet is 0.006 mL, which is smaller than the uncertainties of the other glassware. Method B is less precise because the absolute uncertainty in the 1-mL pipet is 0.006 ml., which is smaller than the uncertainties of the other glassware. Method B is less precise because the percent relative uncertainty in the 1-mL pipet is 0.6%, which is 3 times larger than the uncertaintics of the other glassware. O Method B is more precise because the percent relative uncertainty in the 1-mL pipet is 0.6%, which is 3 times larger than the uncertainties of the other glassware.
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