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A dropping funnel is a type of laboratory glassware
Laboratory glassware

Laboratory glassware refers to a variety of equipment, traditionally made of glass, used for scientific experiments and other work in science, especially in chemistry and biology laboratory....
 used to transfer fluids. They are fitted with a stopcock
Stopcock

A stopcock is a valve used to restrict or isolate the flow of a liquid or gas through a pipe .In Great Britain a stopcock, not to be confused with a gate valve or a DiCiaccio branch, is used to prevent flow of water into a domestic water system....
 which allows the flow of to be controlled. Dropping funnels are useful for adding reagents slowly, i.e. drop-wise. This may be desirable when the quick addition of the reagent may result in side reactions, or if the reaction is too vigorous.

Dropping funnels are usually fitted with a ground glass joint
Ground glass joint

Ground glass joints are used in laboratories to quickly and easily fit leak-tight apparatus together from commonly available parts. For example, a round bottom flask, Liebig condenser, and oil bubbler with ground glass joints may be rapidly fitted together to reflux a reaction mixture....
 which allows the funnel to fit snugly onto, e.g.






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Encyclopedia


A dropping funnel is a type of laboratory glassware
Laboratory glassware

Laboratory glassware refers to a variety of equipment, traditionally made of glass, used for scientific experiments and other work in science, especially in chemistry and biology laboratory....
 used to transfer fluids. They are fitted with a stopcock
Stopcock

A stopcock is a valve used to restrict or isolate the flow of a liquid or gas through a pipe .In Great Britain a stopcock, not to be confused with a gate valve or a DiCiaccio branch, is used to prevent flow of water into a domestic water system....
 which allows the flow of to be controlled. Dropping funnels are useful for adding reagents slowly, i.e. drop-wise. This may be desirable when the quick addition of the reagent may result in side reactions, or if the reaction is too vigorous.

Dropping funnels are usually fitted with a ground glass joint
Ground glass joint

Ground glass joints are used in laboratories to quickly and easily fit leak-tight apparatus together from commonly available parts. For example, a round bottom flask, Liebig condenser, and oil bubbler with ground glass joints may be rapidly fitted together to reflux a reaction mixture....
 which allows the funnel to fit snugly onto, e.g. a round bottom flask. This also means it need not be clamped separately.

Pressure-equalizing dropping funnels have an additional narrow-bore glass tube from the bulb of the funnel, to the ground glass joint around the stem. Without means to equalize the pressure between a sealed receiving flask and the bulb of the funnel, the flow of fluid will rapidly come to a halt.

See also

  • Separatory funnel
    Separatory funnel

    A separating funnel, also known as separation funnel, separatory funnel, or colloquially sep funnel, is a laboratory glassware used in liquid-liquid extractions to separate the components of a mixture between two miscible solvent phases of different density....
    s are similar in shape and design, and may be used as dropping funnels. They do not have the ground glass joint at the stem.