Wrap the Pasteur pipette tip
with a small piece of cotton wool. Immerse the pipette into the solution until the pipette tip reaches
the bottom of the flask while squeezing the rubber bulb. Draw the solution up into the pipette by
Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand 10330
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releasing the rubber bulb. Take off the cotton wool and expel the solution in the pipette into the
proper container).