A Büchner flask, also known as a vacuum flask,[1] filter flask, suction flask, side-arm flask, Kitasato flask or Bunsen flask, is a thick-walled Erlenmeyer flask with a short glass tube and hose barb protruding about an inch from its neck. The short tube and hose barb effectively act 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 of vacuum such as an aspirator, 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 purpose of applying a vacuum is to speed the filtration by providing a pressure differential across the filter medium that is greater than that produced by gravity alone.
Büchner flaskA Büchner funnel is attached to the flask via a black elastomer adapter. The hose barb is connected via vacuum hose to a vacuum source such as an aspirator. The flask should be clamped before use or the hose will likely cause it to tip.Cross section of a Büchner Flask. Note the hose barb pointing right for attaching a vacuum source.
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 (a Büchner ring) at the neck on top of the flask for the filtration of samples. The Büchner funnel holds the sample isolated from the suction by a layer of filter 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.
büchner, flask, also, known, vacuum, flask, filter, flask, suction, flask, side, flask, kitasato, flask, bunsen, flask, thick, walled, erlenmeyer, flask, with, short, glass, tube, hose, barb, protruding, about, inch, from, neck, short, tube, hose, barb, effect. A Buchner flask also known as a vacuum flask 1 filter flask suction flask side arm flask Kitasato flask or Bunsen flask is a thick walled Erlenmeyer flask with a short glass tube and hose barb protruding about an inch from its neck The short tube and hose barb effectively act 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 of vacuum such as an aspirator 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 Buchner flask The purpose of applying a vacuum is to speed the filtration by providing a pressure differential across the filter medium that is greater than that produced by gravity alone Buchner flask A Buchner funnel is attached to the flask via a black elastomer adapter The hose barb is connected via vacuum hose to a vacuum source such as an aspirator The flask should be clamped before use or the hose will likely cause it to tip Cross section of a Buchner Flask Note the hose barb pointing right for attaching a vacuum source The thick wall of the Buchner flask provides it the strength to withstand the pressure difference while holding a vacuum inside It is primarily used together with a Buchner funnel fitted through a drilled rubber bung or an elastomer adapter a Buchner ring at the neck on top of the flask for the filtration of samples The Buchner funnel holds the sample isolated from the suction by a layer of filter paper During filtration the filtrate enters and is held by the flask while the residue remains on the filter paper in the funnel The Buchner 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 chemist Ernst Buchner It is also known as a Kitasato flask in honor of Kitasato Shibasaburō citation needed Notes edit The use of the term vacuum flask sometimes causes confusion with the Thermos flaskReferences editJensen William B September 2006 The Origins of the Hirsch and Buchner Vacuum Filtration Funnels PDF Journal of Chemical Education 83 9 1283 Bibcode 2006JChEd 83 1283J doi 10 1021 ed083p1283 Archived from the original PDF on 2007 03 15 Retrieved 2006 09 08 Retrieved from https en wikipedia org w index php title Buchner flask amp oldid 1183287612, wikipedia, wiki, book, books, library,
