Laboratory Funnels
See Funnels (laboratory)
There are many different kinds of funnels that have been adapted for specialized applications in the laboratory. Filter funnels, thistle funnels (shaped like thistle flowers), and dropping funnels have stopcocks which allow the fluids to be added to a flask slowly. For solids, a powder funnel with a wide and short stem is more appropriate as it does not clog easily.
When used with filter paper, filter funnels, Büchner and Hirsch funnels can be used to remove fine particles from a liquid in a process called filtration. For more demanding applications, the filter paper in the latter two may be replaced with a sintered glass frit.
Separatory funnels are used in liquid-liquid extractions.
Read more about this topic: Funnel
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