A burette is a glass or plastic tube-like instrument with a stopcock at the bottom used to accurately measure and dispense liquid in chemical experiments. The burette is often used in titration experiments to measure precisely how much liquid is being added to a solution. The stopcock can be opened or closed to control the flow of liquid.
Burettes come in different sizes ranging from 10 mL to 100 mL and are commonly made of glass or plastic. They have markings on the side of the tube that indicate the volume of liquid inside the burette. Burettes are usually mounted on a stand to allow for easy use and accurate measurements.
To use a burette, the stopcock is first closed and the burette is filled with the liquid to be dispensed. The initial volume is then recorded by reading the measurement on the burette at eye level. The stopcock is then opened, and the liquid is dispensed into the solution slowly and carefully, with the burette being tilted slightly to allow the liquid to flow out. The burette is then read again to determine the final volume dispensed, and the volume added to the solution can be calculated by subtracting the initial volume from the final volume.
Burettes are an essential tool in any laboratory setting that requires accurate measurement and dispensing of liquids. They are commonly used in analytical chemistry, biochemistry, and in the pharmaceutical industry.