Burette
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A burette (also buret) is a vertical cylindrical piece of laboratory glassware with a volumetric graduation on its full length and a precision tap, or stopcock, on the bottom. It is used to dispense known amounts of a liquid reagent in experiments for which such precision is necessary, such as a titration experiment. Burettes are extremely accurate - a 50 cm3 burette has a tolerance of 0.1 cm3 (class B) or 0.06 cm3 (class A).
Burettes measure from the top since they are used to measure liquids dispensed out the bottom. The difference between starting and final volume is the amount dispensed. Burets are used primarily for titration, to deliver one reactant until the precise end point of the reaction is reached.
[edit] External links
- Using a Burette from ChemLab at Dartmouth College
- http://core.ecu.edu/chem/chemlab/equipment/images/burette.jpg
- Use of the Buret
- Digital burette and selecting the right digital burette
- Margin of error for volumetric measuring instruments
