You have a stock solution certified by a manufacturer to contain 220.0 + 0.4 ug So /ml. You would like to dilute it by a factor of 100 to obtain 2.200 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 20.006 ml. 10-ml transfer pipet 10.02 ml. 100-ml volumetric flask 10.08 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: = 14 He/ml. Incemet Method B: Dilute 1.000 mL up 10 100 mL with a transfer pipet and volumetric flask. absolute uncertainty: 0.6 Helml.

Fundamentals Of Analytical Chemistry
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Chapter7: Statistical Data Treatment And Evaluation
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Problem 7.13QAP
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You have a stock solution certified by a manufacturer to contain 220.0 + 0.4 ug So /mL. You would like to dilute it by a
factor of 100 to obtain 2.200 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
10.02 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.
absolute uncertainty: = 1.4
Mg/ml.
Incorrect
Method B: Dilute 1.000 mL up to 100 mL with a transfer pipet and volumetric flask.
absolute uncertainty: +
0.6
Incomect
Transcribed Image Text:You have a stock solution certified by a manufacturer to contain 220.0 + 0.4 ug So /mL. You would like to dilute it by a factor of 100 to obtain 2.200 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 10.02 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. absolute uncertainty: = 1.4 Mg/ml. Incorrect Method B: Dilute 1.000 mL up to 100 mL with a transfer pipet and volumetric flask. absolute uncertainty: + 0.6 Incomect
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