Experiment 1 - Vanessa Chew Chem 3AL 17 September 2010...

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Vanessa Chew Chem 3AL 17 September 2010 Experiment 1: Calibrating a Pasteur Pipette Discussion The volumes for the three trials using 0.5 and 1.0 mL of water are consistently different. One cannot accurately estimate the volume of liquid just by touch and sight, and it is this human error that explains the differences in volume. The results suggest that full Pasteur pipettes cannot be reliably used to deliver liquids if exact volumes are needed. However, if the liquid is a solvent for a reaction or a recrystallization and an exact volume is not necessary, a full Pasteur pipette may suffice. Questions 1. If an experiment calls for adding exactly 3.1 mL of a given solvent, I would use a graduated cylinder out of the three options. Estimating the volume using a Pasteur pipette is too error- prone and hence cannot be used when exact volumes are needed. But weighing the liquid on a balance is also unnecessary as it is to be used as a solvent, not a reactant. A graduated cylinder or a graduated syringe would be most appropriate for this situation. 2.
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Experiment 1 - Vanessa Chew Chem 3AL 17 September 2010...

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