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

• A. Erlenmeyer Flask
• B. Graduated Cylinder
• C. Filter Flask and funnel
• D. Separatory Funnels

Answer: (B)

When you need to measure liquids with accuracy, use a graduated cylinder. It’s designed specifically for measuring volumes, with clear markings along its length that let you read the amount precisely. These cylinders come in handy small sizes like 10 mL and larger ones such as 50 mL or 100 mL, making them versatile for different amounts. To read it correctly, place the cylinder on a level surface, bring your eyes to the level of the meniscus, and read at the bottom of the curve at the appropriate graduation.

Other glassware serves different purposes: an Erlenmeyer flask is mainly for mixing or heating and typically isn’t read with precision; a filter flask and funnel are used for filtration; a separatory funnel is used for liquid-liquid extraction. The graduated cylinder is the go-to tool for measuring liquid volumes accurately.