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

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter31: Introduction To Analytical Separations

Section: Chapter Questions

Problem 31.19QAP

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The standard addition method is used to analyze a sample of a river water for mercury. Solution A is made by pipetting 5.00 mL of undiluted sample in to a 10 mL volumetric flask and filling to the mark with DI water. Solution B is made by pipetting 5.00 mL of undiluted sample and 3.00 mL of 15.0 ppb of Hg standard into same 10.0 mL volumetric flask and filling to the mark with DI. Solution A and B are analyzed using atomic absorption spectroscopy and give a percent transmittance values of 56 % and 33 % respectively (not blank corrected). A blank has a transmittance of 96%. What is the corrected absorbance of both solution A and B? A. Solution A: 0.123 Solution B: 0.463 B. Solution A: 0.463 Solution B: 0.234 C. Solution A: 0.123 Solution B: 0.234 D. Solution A: 0.234 Solution B: 0.463
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