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A burette is a lab device used in analytical chemistry for the dispensing of variable, measured amounts of a chemical solution.
Burettes come in two main categories:
- Volumetric burette: delivers measured volumes of liquid.
- Weight burette: delivers measured weights of liquid.
Consist of a specially designed burette, fitted with a flat bottom flask, which contains the solution. Filling the burette is done by pumping air inside the burette flask by squeezing a small bulb pump and covering the lower air vent with your finger.
Uses a computer to measure and release exact amounts of solution.
Consists of a long glass tube, with a glass or PTFE stopcock at one end. Filling the burette is done manually, from the top.
Burettes should be cleaned often to prevent the capillaries from clogging up.
For safety reasons, burettes should always be kept filled with a liquid when not in use or covered. This is not required for automatic burettes.