A burette is a laboratory instrument used to accurately measure and dispense small volumes of liquids.
A burette works by using a stopcock valve to control the flow of liquid from the burette tip. The volume of liquid dispensed is read from a scale on the burette.
A burette is commonly used in titration experiments, where precise volumes of a solution are added to another solution until a chemical reaction is complete. It is also used for measuring and dispensing other liquids in various experiments and procedures.
A burette is used for dispensing larger volumes of liquid, typically in the range of 10-50 mL, while a pipette is used for smaller volumes, usually less than 10 mL. Additionally, a burette allows for more precise control of the volume being dispensed compared to a pipette.
To use a burette, it should be first rinsed with the solution being used and then filled to the desired volume. The stopcock valve should be opened slowly to dispense the liquid and the burette should be read at eye level to ensure accuracy. After use, a burette should be emptied, rinsed with distilled water, and stored in a vertical position. It is important to regularly calibrate and clean a burette to ensure accurate measurements.