You have a stock solution certified by a manufacturer to contain 160.0 ± 0.4 μg SO/mL. You would like to dilute it by a factor of 100 to obtain 1.600 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 ±0.02 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 Why is one method more precise than the other? 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 uncertainties of the other glassware. Method B is more precise because the percent relative uncertainty in the lam ninet is 0.6%, which is 3 timer le
You have a stock solution certified by a manufacturer to contain 160.0 ± 0.4 μg SO/mL. You would like to dilute it by a factor of 100 to obtain 1.600 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 ±0.02 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 Why is one method more precise than the other? 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 uncertainties of the other glassware. Method B is more precise because the percent relative uncertainty in the lam ninet is 0.6%, which is 3 timer le
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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