Which glassware is designed to prepare a solution to a precisely known final volume?

• A. Pipette
• B. Beaker
• C. Desiccator
• D. Volumetric flask

Answer: (D)

Precise final volume requires glassware that is calibrated to contain a specific amount when filled to a marked line. A volumetric flask is designed for this purpose: its neck carries a single calibration mark that defines the exact volume the flask will hold when the liquid reaches that line, typically at a standard temperature. This makes it ideal for preparing standard solutions or dilutions to a known volume, ensuring accurate concentration calculations. A beaker is general-purpose and not volume-accurate; a pipette can transfer a precise amount but does not by itself define the final container volume; a desiccator is used for drying and storing samples, not for preparing solutions with a known final volume. Therefore, the glassware intended for preparing a solution to a precisely known final volume is the volumetric flask.