You have a stock solution certified by a manufacturer to contain 245.0±0.2 ?g SO2−4/mL. You would like to dilute it by a factor of 100 to obtain 2.450 ?g/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.
You have a stock solution certified by a manufacturer to contain 245.0±0.2 ?g SO2−4/mL. You would like to dilute it by a factor of 100 to obtain 2.450 ?g/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±0.006 mL
10‑mL transfer pipet ±0.02 mL±0.02 mL
100‑mL volumetric flask ±0.08 mL±0.08 mL
Method A: Dilute 10.00 mL up to 100mL 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: ±.-----?g/mL
Method B: Dilute 1.000 mL up to 100 mL with a transfer pipet and volumetric flask.
absolute uncertainty: ±------?g/mL
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