You have a stock solution certified by a manufacturer to contain 225.0 ± 0.4 ug SO-/mL. You would like to dilute it by a fac of 100 to obtain 2.250 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

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You have a stock solution certified by a manufacturer to contain 225.0 + 0.4 ug SO-/mL. You would like to dilute it by a factor
of 100 to obtain 2.250 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.
0.004
absolute uncertainty: +
ug/mL
Incorrect
Transcribed Image Text:You have a stock solution certified by a manufacturer to contain 225.0 + 0.4 ug SO-/mL. You would like to dilute it by a factor of 100 to obtain 2.250 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. 0.004 absolute uncertainty: + ug/mL Incorrect
Method B: Dilute 1.000 mL up to 100 mL with a transfer pipet and volumetric flask.
0.009
absolute uncertainty: +
ug/mL
Incorrect
Transcribed Image Text:Method B: Dilute 1.000 mL up to 100 mL with a transfer pipet and volumetric flask. 0.009 absolute uncertainty: + ug/mL Incorrect
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