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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A student would like to prepare a 0.010 M solution from a 1.0 M stock solution with minimal error. The student can choose to do a one-step dilution that uses a 10 mL transfer pipet and a 1000 mL volumetric flask or a two-step dilution using a 50 mL pipet and a 1000 mL volumetric flask for the first dilution, and a 100 mL pipet and a 500 mL volumetric flask for the second dilution. Which method has the smallest overall relative uncertainty and what is the value? **Use table 4.2 on page 70 in your textbook for tolerances of the glassware. O One-step dilution; 0.0020 Two-step dilution; 0.0020 O Two-step dilution; 0.0014 O One-step dilution; 0.0010
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