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Determining
the Volume of a Drop
This was a necessary step because titration requires knowing the exact
volume of solution titrated. I decided to use a 10 ml syringe for titration
because it was easier to control than a pipette but still had volume markings.
I did not want to just use a straw because it would be as difficult to
control as a pipette and because I needed to know exact volumes for my
calculations.
1. 5 ml of water was drawn into a 10 ml syringe. Bubbles were removed
by holding the syringe upright and gently tapping.
2. The syringe was set to a volume of 4 ml.
3. The syringe was held vertical and the plunger depressed gently to
release drops of water until the syringe was at a volume of 3 ml.
4. The number of drops contained in 1 ml were counted.
5. Steps 1 to
4 were repeated to ensure precision. The number of drops equal to 1 ml was 20
both times.
Note: Care was taken to hold the syringe
vertical. Drop size was different when the syringe was held on a slant.
Analytical Equipment
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