Which glassware is typically used for storage of known concentration solutions and allows for precise measurement of a single volume?

• A. Beaker
• B. Erlenmeyer Flask
• C. Graduated Cylinder
• D. Volumetric Flask

Answer: (D)

Volumetric glassware is designed to contain a precise single volume when filled to a calibration mark. This makes it ideal for storing solutions of known concentration and for preparing standard solutions with a defined final volume. The neck has a single graduation, and the flask is calibrated to deliver a exact volume (at a specified temperature), so the concentration of the stored solution remains well defined.

Beakers and Erlenmeyer flasks are better for mixing, heating, or rough handling of liquids and do not provide a single exact volume. A graduated cylinder can measure volumes with good precision but is not used to store a solution at a precise, fixed volume for later use; its markings are for measuring, not for guaranteeing a fixed final volume like a volumetric flask.