Of the following, which is the best tool for making an accurate and precise measurement of 21.7 mL of water?

Rationale

A graduated cylinder.

A graduated cylinder is specifically designed for measuring liquid volumes accurately and precisely, making it the best choice for measuring 21.7 mL of water. Its marked increments allow for detailed readings, ensuring that measurements can be both exact and reproducible.

A (An eyedropper) YOUR ANSWER

An eyedropper is primarily used for transferring small amounts of liquid and lacks precise volume markings that would allow for accurate measurement of 21.7 mL. While it can dispense liquid in small quantities, it is not suitable for making exact measurements necessary for scientific work.

B (A test tube) YOUR ANSWER

A test tube is not calibrated for measuring specific volumes; it typically lacks measurement markings altogether. While it can hold liquids, using a test tube to measure 21.7 mL would be imprecise, as it does not provide a way to determine the exact volume of the liquid contained within.

C (A graduated cylinder) CORRECT

A graduated cylinder features precise volume markings that allow for accurate measurement of liquids. Its design minimizes meniscus error, making it the best tool for measuring specific volumes such as 21.7 mL. This instrument is widely used in laboratories for its reliability in providing accurate liquid measurements.

D (A plastic beaker) YOUR ANSWER

While a plastic beaker can hold liquids and may have some volume markings, it is generally less accurate than a graduated cylinder. The imprecise nature of beaker measurements makes it unsuitable for tasks requiring exact volume readings like 21.7 mL.

Conclusion

For measuring liquid volumes accurately, a graduated cylinder is the optimal choice due to its design and precise measurement capabilities. Unlike other options that either lack accuracy or are not designed for measurement, the graduated cylinder provides the necessary precision for scientific tasks, ensuring reliable results in measurements such as 21.7 mL of water.

Of the following, which is the best tool for making an accurate and precise measurement of 21.7 mL of water?

A graduated cylinder.

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