You have a stock solution certified by a manufacturer to contain 205.0+ 0.2 µg SO-/mL. You would like to dilute it by a factor of 100 to obtain 2.050 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 1-ml. transfer pipet 10-ml. transfer pipet 100-ml. volumetric flask 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: ± Tolerance +0.006 ml. +0.02 ml. ±0.08 ml. 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 205.0+ 0.2 µg SO-/mL. You would like to dilute it by a factor of 100 to obtain 2.050 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 1-ml. transfer pipet 10-ml. transfer pipet 100-ml. volumetric flask 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: ± Tolerance +0.006 ml. +0.02 ml. ±0.08 ml. Method B: Dilute 1.000 mL up to 100 ml. with a transfer pipet and volumetric flask. absolute uncertainty: ± µg/mL µg/ml.

Chemistry

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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

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Question

You have a stock solution certified by a manufacturer to contain 205.0 + 0.2 ug So -/mL. You would like to dilute it by a factor
of 100 to obtain 2.050 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
1-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: +
Hy/ml
Method B: Dilute 1.000 mL up to 100 ml. with a transfer pipet and volumetric flask.
absolute uncertainty: +
Hy/ml
Why is one method more precise than the other?
Method B is more 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 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.
O Method B is more precise because the percent relative uncertainty in the l-ml. pipet is 0.6%. which is 3 times larger
than the uncertainties of the other glassware.

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