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 is the best tool for making an accurate and precise measurement of 21.7 mL of water.

Graduated cylinders are specifically designed for measuring liquid volumes with high accuracy and precision, featuring clear markings that allow for easy reading of the measurement at meniscus level.

A (An eyedropper) YOUR ANSWER

Eyedroppers are primarily used for dispensing small amounts of liquid rather than measuring precise volumes. The volume they can hold is typically much less than 21.7 mL, making them unsuitable for accurate measurements of larger quantities of liquid.

B (A test tube) YOUR ANSWER

Test tubes do not usually have measurement markings, making it difficult to ascertain the exact volume of liquid inside. While they can hold various volumes, they lack the calibration necessary for precise volume measurements like those required for 21.7 mL of water.

C (A graduated cylinder) CORRECT

Graduated cylinders are designed with precise volume markings, allowing users to measure liquids accurately. They provide a clear view of the liquid’s meniscus, ensuring that measurements can be taken with minimal error, making them the ideal choice for measuring 21.7 mL of water.

D (A plastic beaker) YOUR ANSWER

Plastic beakers typically have volume markings, but they are not as precise as those found on graduated cylinders. The wider mouth and less defined measurement lines can lead to inaccuracies when attempting to measure specific volumes like 21.7 mL.

Conclusion

For the accurate and precise measurement of 21.7 mL of water, a graduated cylinder is the most suitable tool due to its design and clear volume markings. Other options, such as eyedroppers, test tubes, and plastic beakers, lack the necessary accuracy or precision, making them inadequate for this specific measurement task.

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

A graduated cylinder is the best tool for making an accurate and precise measurement of 21.7 mL of water.

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