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QUESTION
Which of the following methods for preparing a 0.0010 F solution from a 1.0 F stock solution provides the smallest overall uncertainty?
Which of the following methods for preparing a 0.0010 F solution from a 1.0 F stock solution provides the smallest overall uncertainty?
A) A one-step dilution using a 1-mL pipet and a 1000-mL volumetric flask.
B) A two-step dilution using a 20 mL pipet and a 1000 mL volumetric flask for the first dilutions and a 25 mL pipet and a 500 mL volumetric flask for the second dilution.
Random Uncertainties for glassware:
1 mL pipet: 0.0006 mL
20 mL pipet: 0.03 mL
25 mL pipet: 0.03 mL
500 mL volumetric flask: 0.2 mL
1000 mL volumetric flask: 0.3 mL
