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.

A graduated cylinder is specifically designed for measuring liquid volumes accurately and precisely, with clear markings that allow for easy reading. Its narrow shape minimizes meniscus error, making it the preferred choice for such measurements.

A (An eyedropper) YOUR ANSWER

An eyedropper is not suitable for measuring specific volumes like 21.7 mL due to its limited capacity and lack of precise volume markings. It is typically used for adding small amounts of liquid rather than for accurate measurements.

B (A test tube) YOUR ANSWER

A test tube is primarily used for mixing, heating, or holding liquids rather than for precise volume measurement. While it can contain water, it lacks the graduated markings needed to measure 21.7 mL accurately and consistently.

C (A graduated cylinder) CORRECT

A graduated cylinder is specifically designed for measuring liquid volumes and has graduated markings that allow for precise reading. Its structure minimizes the error associated with the meniscus, making it the best choice for accurately measuring 21.7 mL of water.

D (A plastic beaker) YOUR ANSWER

A plastic beaker is generally used for holding and mixing liquids rather than for accurate volume measurements. Although it may have volume markings, these are often less precise compared to those on a graduated cylinder, leading to potential measurement inaccuracies.

Conclusion

For measuring 21.7 mL of water, a graduated cylinder is the ideal tool due to its design and accuracy. While other tools like eyedroppers, test tubes, and plastic beakers serve important functions in the laboratory, they do not provide the precision necessary for specific volume measurements. The graduated cylinder's clear markings and shape ensure reliable results, making it the best choice for this 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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