Which instrument is used to measure the volume of liquids and is available in 10 mL and 50 mL/100 mL sizes?

• A. Filter Flask and funnel
• B. Three Neck Flasks
• C. Graduated Cylinder
• D. Erlenmeyer Flask

Answer: (C)

Measuring liquids accurately relies on a tool with clearly labeled, evenly spaced calibration marks you can read at eye level. A graduated cylinder is built for this purpose, providing precise volume readings from the markings along its length. The design allows you to read the exact amount by looking at the bottom of the liquid’s meniscus, which gives a reliable measure especially when the cylinder is chosen in a size like 10 mL or 50 mL/100 mL—smaller sizes offer finer precision, while larger sizes provide capacity for bigger volumes with still good accuracy.

Other lab tools shown have different primary roles. A filter flask and funnel are used for separating solids from liquids during filtration, not for measuring volume with precision. Three-neck flasks are specialized for complex setups like multiple connections in reactions or distillations. An Erlenmeyer flask is great for mixing and heating, and it may have volume markings, but its shape makes precise measurement less reliable than a graduated cylinder.