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You have a stock solution certified by a manufacturer to contain 175.0 z 0.3 wg SO;"/ml. You would like to dilute it by a factor of 100 to obtain 1.750 g/ml. Two possible methods of dilution are stated. For cach method, calculate the resulting absolute uncertainty in concentration. Use the manufacturer's tolerances in the table for uncertainties. Glassware Tolerance 1-ml. transfer pipet 10 ml. transfer pipet 100-ml, volumetric flask +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. abuolute uncertainty: wg/mL Method B: Dilute 1.000 ml. up to 100 ml. with a transfer pipet and volumetric flask. absolute uncertainty: t wg/ml

You have a stock solution certified by a manufacturer to contain 175.0 z 0.3 wg SO;"/ml. You would like to dilute it by a factor of 100 to obtain 1.750 g/ml. Two possible methods of dilution are stated. For cach method, calculate the resulting absolute uncertainty in concentration. Use the manufacturer's tolerances in the table for uncertainties. Glassware Tolerance 1-ml. transfer pipet 10 ml. transfer pipet 100-ml, volumetric flask +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. abuolute uncertainty: wg/mL Method B: Dilute 1.000 ml. up to 100 ml. with a transfer pipet and volumetric flask. absolute uncertainty: t wg/ml

Fundamentals Of Analytical Chemistry
Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter7: Statistical Data Treatment And Evaluation
Section: Chapter Questions
Problem 7.21QAP
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You have a stock solution certified by a manufacturer to contain 175.0 + 0.3 mg SO;-/ml. You would like to dilute it by a factor of 100 to obtain 1.750 pg/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 10 mL transfer pipet 100-ml volumetric flask +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: + wg/mL Method B: Dilute 1.000 ml. up to 100 ml. with a transfer pipet and volumetric flask. absolute uncertainty: + wg/mL Why is one method more precise than the other? 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. O Method B is more precise because the absolute uncertainty in the 1-ml pipet is 0.006 mL., which is smaller than the uncertaintics of the other glassware. O Method B is less precise hecause 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 less precise because the percent relative uncertainty in the 1-ml. pipet is 0.6%, which is 3 times larger than
Transcribed Image Text:You have a stock solution certified by a manufacturer to contain 175.0 + 0.3 mg SO;-/ml. You would like to dilute it by a factor of 100 to obtain 1.750 pg/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 10 mL transfer pipet 100-ml volumetric flask +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: + wg/mL Method B: Dilute 1.000 ml. up to 100 ml. with a transfer pipet and volumetric flask. absolute uncertainty: + wg/mL Why is one method more precise than the other? 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. O Method B is more precise because the absolute uncertainty in the 1-ml pipet is 0.006 mL., which is smaller than the uncertaintics of the other glassware. O Method B is less precise hecause 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 less precise because the percent relative uncertainty in the 1-ml. pipet is 0.6%, which is 3 times larger than
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