What is Büchner funnel?
A '''büchner funnel''' is a piece of laboratory equipment which is used to [[filter]] or separate a [[liquid]] from a [[solid]]. It is named after an industrial chemist called [[Ernst Büchner]]. == Structure == [[Image:Embudo Büchner.jpeg|thumb|230px|A Büchner Funnel]] A Büchner funnel can be made out of [[porcelain]], [[glass]] or [[plastic]]. On the top there is a container with a hole in the bottom. This container is put on top of a [[Büchner flask]] with a hole in the top and a hole in the side. In between the container and the Büchner flask there is a piece of [[filter]] paper which lets through liquids but not any solids. Attached to the hole in the side there is a [[vacuum]] which sucks the air out of the Büchner flask. This means that when any mixture is poured into the top, the liquid is sucked through the filter paper and the solid is left stuck in the filter paper. == Uses == A Büchner flask is used in [[chemistry]] to take unwanted solids out of any liquids. The advantages of using a Büchner flask over just a piece of filter paper held over a [[beaker]] is that the solid is dried as more and more liquid is sucked off of it by the vacuum. Most of the time it needs to be dried again in an [[oven]], but sometimes no further drying is needed. ==Related pages== *[[Büchner flask]] ==Other websites== *[http://www.labdepotinc.com/category_details~id~303.aspx A Büchner funnel manufacturer] {{Webarchive|url=https://web.archive.org/web/20070714213318/http://www.labdepotinc.com/Category_Details~id~303.aspx |date=2007-07-14 }} *[http://www.alken-murray.com/Buchlfunnel.html Experiment using Büchner funnels] *[http://www.thesciencefair.com/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=BF More examples of Büchner funnels] {{LaboratoryEquipment}} {{DEFAULTSORT:Buchner funnel}} [[Category:Laboratory equipment]]