12. Of the following, which is the best tool for making an accurate and precise measurement of 21.7 mL of water?
Answer: C
C: A graduated cylinder
A graduated cylinder is the best tool for making an accurate and precise measurement of 21.7 mL of water. It is specifically designed for measuring liquid volumes with high accuracy due to its narrow shape and clearly marked scale.
A) An eyedropper
An eyedropper is not suitable for measuring precise volumes like 21.7 mL. While it can dispense small amounts of liquid, it lacks the necessary markings for accurate measurement and is more appropriate for adding small quantities rather than measuring larger volumes.
B) A test tube
A test tube is designed for holding and mixing liquids rather than for precise measurement. Although it can contain 21.7 mL of water, it does not have graduated markings to measure the volume accurately, making it an inadequate choice for this purpose.
C) A graduated cylinder
A graduated cylinder is the ideal tool for measuring 21.7 mL of water accurately. Its design features a scaled measurement system that allows for easy reading of liquid levels, ensuring both accuracy and precision in measurement.
D) A plastic beaker
A plastic beaker, while useful for holding liquids, is not the best choice for precise measurements. Its wider opening and less defined scale can lead to inaccuracies in reading liquid volumes, making it less effective for measuring specific amounts like 21.7 mL.
Conclusion
The graduated cylinder stands out as the most effective tool for measuring 21.7 mL of water due to its design and precision capabilities. In contrast, the eyedropper, test tube, and plastic beaker lack the necessary accuracy and precision for such specific measurements, underscoring the importance of using the right tool for accurate scientific work.