What laboratory equipment is specifically used for titrating a chemical reagent?

The buret is the ideal laboratory equipment specifically designed for titrating a chemical reagent. It allows for the precise delivery of a liquid reagent to a reaction mixture, enabling the measurement of the volume of the reactant being added. The buret is equipped with a stopcock that can control the flow of the reagent, ensuring that small, accurate quantities can be dispensed drop by drop. This precision is crucial in titrations, where the endpoint of the reaction needs to be determined accurately to calculate concentrations.

In contrast, other types of equipment such as beakers, test tubes, and pipets serve different purposes. Beakers are primarily used for mixing and holding liquids but do not provide the accuracy needed for titration. Test tubes are also used for holding small quantities of liquid and performing reactions, but they lack the control necessary for titration processes. Pipets can be used to measure and transfer specific volumes of liquid, but they are not designed for continuous delivery or measurement during a titration. Thus, the buret stands out as the best option for titrating chemical reagents.