Which instrument typically allows measurements with two decimal places of precision?

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

Answer: (C)

Precision in measuring liquids comes from using glassware that is designed for an exact volume. A volumetric flask is built for that purpose: it has a single calibration mark and is used to prepare solutions by filling to that line. Because the volume is fixed and the line is highly accurate, you can report the amount to two decimal places with confidence. This is essential when preparing standard solutions where exact concentrations matter.

Beakers and Erlenmeyer flasks are designed for mixing and rough pouring, with broad, imprecise volume markings that are read more as estimates. Reading them to two decimals would be unreliable due to their shape, the way the liquid sits, and the lack of a precise calibration line. A graduated cylinder does offer finer measurements than a beaker or Erlenmeyer, but its marks vary and, while useful, they typically don’t provide the same level of exactness as a volumetric flask meant for delivering a single precise volume.