A burette with rubber typically refers to a laboratory glassware device known as a burette that includes a rubber or rubberized component as part of its construction. A burette is used for precise volumetric measurements of liquids, especially in titration experiments. The rubber component is usually found at the top of the burette and serves as a stopper or valve to control the flow of liquid from the burette into another container, such as a flask or beaker. Burettes with rubber components are commonly used in titration procedures because they provide precise control over the volume of liquid being added to the reaction. The rubber stopper allows for slow and controlled dispensing, which is essential for accurate titration measurements. Proper care and maintenance of the rubber components, such as cleaning and ensuring they are free from cracks or damage, are important to prevent any issues with leakage or inaccurate measurements during experiments.