February 23, 2024

What Are Funnels Used For?

What are funnels used for?

Funnels are used in a wide variety of laboratory applications to transfer liquids into containers with smaller openings, such as bottles, vials, and test tubes. Unlike the familiar paper funnels used in kitchens (for example, adding motor oil to your car), laboratory funnels are usually made from materials that can withstand the heat and chemicals used in professional labs. Some laboratory funnels, such as decanting and powder addition funnels, have wider mouths for transferring dry or chunky material; others, like filtering or Hirsch funnels, have narrower necks.

The basic laboratory funnel is a glass or polypropylene cone with sides that are angled at 60 degrees, ideal for preventing vapor lock when handling solvents. The rim of the bowl may have internal or external ribbing to further prevent vapor lock, and it is available in various sizes to accommodate standard filter papers. If you want to monitor the progress of a specific filtration process, consider using an analytical funnel, which features long stems for easy access and can be adapted for use with a vacuum hose.

These laboratory funnels, also known as addition or dropping funnels, are used for the dosed addition of solutions, reaction mixtures, and chemicals into reaction vessels and flasks. They have a longer, cylindrical body with a ground glass joint and a tap at the bottom for controlled dispensing of reagents. For transferring powders into reaction vessels, choose a powder addition funnel with a large bore stem.

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