Difference between revisions of "Burette"
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===Electronic=== | ===Electronic=== | ||
| − | Uses a computer to measure and release exact amounts of solution. | + | Uses a small computer to measure and release exact amounts of solution. They are generally screwed on a large bottle, which is filled with the desired liquid/solution. |
===Straight burette=== | ===Straight burette=== | ||
| − | Consists of a long glass tube, with a glass or PTFE stopcock at one end. Filling the burette is done manually, from the top. | + | Consists of a long glass tube, with a glass or PTFE stopcock at one end. Filling the burette is done manually, from the top, or in case of thin burettes, using a [[rubber bulb]] to draw liquid from the end, in a similar way to pipettes. |
==Maintenance== | ==Maintenance== | ||
Burettes should be cleaned often to prevent the capillaries from clogging up. | 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. | + | For safety reasons, burettes should always be kept filled with a liquid, most often distilled water, when not in use or covered, usually to limit dust or other contamination. This is not required for automatic burettes. |
==See also== | ==See also== | ||
*[[Syringe]] | *[[Syringe]] | ||
| + | *[[Titration]] | ||
==References== | ==References== | ||
Latest revision as of 18:21, 11 December 2018
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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.
Contents
General
Burettes come in two main categories:
- Volumetric burette: delivers measured volumes of liquid.
- Weight burette: delivers measured weights of liquid.
Types
Automatic burette
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.
Electronic
Uses a small computer to measure and release exact amounts of solution. They are generally screwed on a large bottle, which is filled with the desired liquid/solution.
Straight burette
Consists of a long glass tube, with a glass or PTFE stopcock at one end. Filling the burette is done manually, from the top, or in case of thin burettes, using a rubber bulb to draw liquid from the end, in a similar way to pipettes.
Maintenance
Burettes should be cleaned often to prevent the capillaries from clogging up.
For safety reasons, burettes should always be kept filled with a liquid, most often distilled water, when not in use or covered, usually to limit dust or other contamination. This is not required for automatic burettes.
