You have a stock solution certified by a manufacturer to

You have a stock solution certified by a manufacturer to contain 160.0 ± 0.3 µg SO42−/mL. You would like to dilute it by a factor of 100 to obtain 1.600 µg/mL. Two possible methods of dilution are stated below. For each method, calculate the resulting uncertainty in concentration. Use manufacturer's tolerances in the Tolerances of Class A Volumetric Flasks table and Tolerances of Class A Transfer Pipets table for uncertainties.
(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.
(b) Dilute 1.000 mL up to 100 mL with a transfer pipet and volumetric flask. 


Please calculate the resulting uncertainties in the concentration for each method.
(Class A) Tolerance for 100ml capacity volumetric flask = +/-0.08mL

(Class A) Tolerance for 10ml transfer pipet= +/-0.02mL

(c) Explain why one method is more precise than the other.


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