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Unformatted text preview: transfer is
only as good as the technique of the operator will allow.
In making any volume measurement, the liquid level should always be the same
as your eye level. Erlenmeyer flasks and graduated cylinders are usually
filled/read by raising them to your eye rather than by squatting down to bring your
eye level to the bench top. The liquid level in a pipet is always lowered to the
mark while the mark is held steady at eye level. Burets: With practice, the position of the
meniscus of a liquid in the 25 mL burets
used in the Chemistry 2 labs can be
estimated to within 0.02 mL. Figure 5
shows the use of a card with a dark strip on
it to sharpen the image of the meniscus.
You will find by experiment that if the top
of the strip is positioned slightly below the
level of the liquid in the buret, the bottom
of the meniscus will be very easy to see. Figure 5: Reading the Meniscus You should always use the following procedure when changing the solution in a
buret. First, empty the buret out the top and half-fill it with deionized water.
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.
- Spring '07