What glassware will most accurately measure 100 mL of solution?

The 100 mL volumetric flask is designed specifically for accurately measuring precise volumes of liquids. It has a fixed volume line at the neck that indicates the exact point to which the liquid should be filled, ensuring that the measurement is accurate. The shape of a volumetric flask minimizes meniscus error, and its narrow neck assists in achieving precision.

In contrast, other choices, such as a graduated cylinder, while also capable of measuring volume, may have larger gradations that can lead to less precision in measurements. Beakers and Erlenmeyer flasks are primarily designed for mixing and heating rather than measuring volume accurately and lack the calibration necessary to ensure a precise measurement of 100 mL. Thus, when accuracy is paramount, the volumetric flask is the preferred choice.