A burette is a laboratory instrument used to measure and dispense precise volumes of liquid, often in chemistry experiments. It is a long, graduated glass tube with a stopcock at the bottom, allowing for controlled release of the liquid. Burettes are commonly used in titrations, where a solution of known concentration is added to a solution of unknown concentration to determine its concentration. Using a burette ensures accuracy in measurements, which is crucial in scientific experiments. The markings on the burette help scientists track the volume of liquid dispensed. Proper use of a burette can lead to more reliable results in experiments involving acids, bases, and other chemical solutions.