Dropping bottle
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A dropping bottle is a type of lab glass item used to add a liquid or solution dropwise.
Contents
General
The dropping bottle consists of a small bottle with a ground glass joint, where a ground glass joint stopper with a slit is present. By rotating the stopper in the opposite direction, the stopper becomes open, though this feature is not universally present. It is often made of borosilicate or soda-lime glass.
Another type of glassware often called dropping bottle consists of a glass dropper with a rubber bulb inserted through a ground joint stopper resting on a small bottle with a ground glass joint. Other models have a screw cap. However, since the screw cap is often compatible with many other common glass bottles, and it's fairly easy to ram a glass bulb dropper through any stopper, this item can be simply considered a glass dropper with a bulb resting on any glass bottle, stretching the definition of a dropping bottle.
Availability
Dropping bottles are sold by lab suppliers and can also be bought online cheaply.
DIY dropping bottle
If you have a small bottle with a ground glass joint, and a damaged stopper, like a Winkler flask for example, simply carve a small slit along the ground glass joint, which should allow the liquid to flow dropwise.
Uses
Dropping bottles are mainly used to add either dyes, adjust pH of solutions or to add an indicator in another solution.
Gallery
A glass dropping bottle with a solution.
