- Büchner flask
[
aspirator . The flask should be clamped before use or the hose will likely cause it to tip.]A Büchner flask, also known as a vacuum flask,The use of the term "vacuum flask" sometimes causes confusion with the Thermos flask] filter flask, side-arm flask or Kitasato flask, is a thick-walled
Erlenmeyer flask with a short glass tube and protruding about an inch from its neck. The short tube and hose barb effectively acts as an adapter over which the end of a thick-walled flexible hose (tubing) can be fitted to form a connection to the flask. The other end of the hose can be connected to source ofvacuum such as anaspirator ,vacuum pump , or house vacuum. Preferably this is done through a trap (see below), which is designed to prevent the sucking back of water from the aspirator into the Büchner flask.The thick wall of the Büchner flask provides it the strength to withstand the pressure difference while holding a vacuum inside. It is primarily used together with a
Büchner funnel fitted through a drilled rubber bung or an elastomer adapter at the neck on top of the flask forfiltration of samples. The Büchner funnel holds the sample isolated from the suction by a layer offilter paper . During filtration, the filtrate enters and is held by the flask while the residue remains on the filter paper in the funnel.The Büchner flask can also be used as a vacuum trap in a vacuum line to ensure that no fluids are carried over from the aspirator or vacuum pump (or other vacuum source) to the evacuated apparatus or vice versa.
It is commonly thought to be named after the Nobel Laureate,
Eduard Buchner , but it is actually named after the industrial chemistErnst Büchner . It is also known as a Kitasato flask, in honor ofShibasaburo Kitasato ee also
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Büchner Bong References and notes
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