The dropping funnel is a glass device for the metered addition of chemicals to a reaction mixture. For this purpose, the dropping funnel can be installed on suitable multi-neck flasks thanks to its standard joint . The dropping funnels are available with or without pressure compensation, usually the version with pressure compensation (also called Mariott's tube) is used. The dropping funnels can be closed at the top with a stopper or a drying tube that is filled with calcium chloride , for example . The flow of the chemical to the reaction solution in the multi-necked flask is regulated by a cock.
- Walter Wittenberger: Chemische Laboratoriumstechnik , Springer-Verlag, Vienna, New York, 7th edition, 1973, pp. 81–82, ISBN 3-211-81116-8 .