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
Chapter31: Introduction To Analytical Separations
Section: Chapter Questions
Problem 31.19QAP
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