Canadian Society for Medical Laboratory Science (CSMLS) Practice Exam

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What is used to measure precise volume?

Graduated cylinder
Beaker
Erlenmeyer flask
Volumetric flask

The correct answer is: Volumetric flask

The volumetric flask is specifically designed for the precise measurement of liquid volumes. Its narrow neck and flat bottom allow for accurate volumetric measurements by providing a single calibrated line. When a liquid is filled up to this mark, it ensures that the exact volume indicated is present, making it particularly useful for preparing standard solutions in laboratory settings where accuracy is paramount. In contrast, other options like graduated cylinders, beakers, and Erlenmeyer flasks, while useful for measuring volume, do not offer the same level of precision. Graduated cylinders are more accurate than beakers or flasks, but they are still intended for general volume measurements rather than the exact precision that a volumetric flask provides. Beakers and Erlenmeyer flasks are primarily used for mixing or heating liquids, and although they have graduated markings, they are not calibrated for precise volumetric measurements. This distinction highlights why the volumetric flask is the correct choice for measuring precise volumes.