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Unformatted text preview: he other fingers on the hand holding it.) Be patient because if you overshoot the mark you must begin the
whole process again.
Remove the accurately filled pipet from its container and while still tightly sealing
its top with your finger, quickly dry the lower portion of the shaft with a single
downward stroke of a laboratory tissue. Tilt the final receiver slightly and while
holding the pipet vertical, place its tip against the receiver wall so that when take
your finger off of the pipet mouth, liquid will flow smoothly down to the bottom
of the vessel. You want to avoid splashing as much as possible. Keep the tip of
the pipet in contact with the flask sidewall for at least 30 seconds after it looks
empty, and then remove it from the receiver.
The pipets in the Chemistry 2 laboratories are calibrated "to deliver" the specified
quantity of liquid rather than "to contain" it. What this really means is that you
should never blow the last drops out of them.
6. Filtration You wi...
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- Spring '07