Separating funnels

A separatory funnel is a glass container used in the chemical laboratory to separate immiscible liquids.

The device has a standard ground connection at the top, which can be closed with a stopper, and a tap at the bottom. If two immiscible liquids (two phases) are poured in (e.g. water and oil), the liquid with the greatest density collects at the bottom (i.e. the water in the case of water and oil) and can be drained through the tap into a other vessel will be disposed of. The conical shape of the separatory funnel, which narrows downwards, facilitates an exact separation, i.e. closing the tap, just before the lighter phase starts to run out.

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