Which glassware is used to transfer and measure variable volumes?

• A. Beaker
• B. Volumetric Pipet
• C. Buret
• D. Erlenmeyer Flask

Answer: (C)

Transferring and measuring variable volumes requires a device that allows controlled release and precise measurement of how much liquid has been added. A buret is designed for this: it is a long, graduated tube with a stopcock that lets you add liquid drop by drop and read the exact amount delivered by noting the difference between the initial and final volumes. This makes it ideal for experiments like titrations where you need to measure variable, precisely controlled volumes.

Other glassware isn’t suited for this purpose. A beaker is used for rough pouring and approximate volumes, not precise delivery. A volumetric pipet delivers a single, fixed volume with high accuracy, not variable amounts. An Erlenmeyer flask is mainly for mixing or heating and has only approximate volume markings.