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Unformatted text preview: pcock and drain about 5 mL out of the tip. Over the sink, empty the
buret out the top by inverting it swiftly, and then repeat the water washing, this
time also opening the stopcock when the buret is inverted to allow most of the
water to drain back out of the tip. Wait about 30 seconds for drainage and then
close the stopcock. While it is still upside down, blot/wipe off the top of the buret
with a laboratory tissue. Then turn it upright, and using a clean beaker for the
transfer, add enough of the new solution to bring the liquid level up to about the
48 mL mark. Next, drain part of the liquid out of the tip into a waste receiver,
close the stopcock, and wipe off the tip with a laboratory tissue. Then, at the sink,
cradle the top of the buret between the thumb and index finger of one hand.
While holding it by the tip with your other hand, turn the buret horizontal. While
twirling the buret by the tip, slowly empty it through the top, being careful to wet
the entire interior wall with the new solution. Repeat thi...
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- Spring '07