Difficulty: Easy

Average Score: 100%

Which of the following is the best procedure for measuring liquid in a graduated cylinder?

Rationale

Place the cylinder on a level surface and read the bottom of the meniscus.

To accurately measure liquid in a graduated cylinder, it is crucial to ensure that the cylinder is on a level surface and to read the measurement at the bottom of the meniscus, which is the curved surface of the liquid. This method provides the most precise and consistent measurement.

A (Place the cylinder on a level surface and read the top of the meniscus.) YOUR ANSWER

Reading the top of the meniscus can lead to inaccurate measurements because the meniscus may be curved due to surface tension. This curvature means that the top of the meniscus does not represent the true liquid level, which can result in an overestimation of the volume.

B (Hold the cylinder at eye level and read the bottom of the meniscus.) YOUR ANSWER

While holding the cylinder at eye level is correct for avoiding parallax errors, reading the bottom of the meniscus without placing the cylinder on a level surface can still yield inaccurate results. The cylinder must be stable on a flat surface to ensure an accurate reading.

C (Hold the cylinder at eye level and read the top of the meniscus.) YOUR ANSWER

Similar to choice A, reading the top of the meniscus, even at eye level, can lead to inaccuracies due to the curvature of the liquid's surface. This choice disregards the necessity of reading the measurement from the bottom of the meniscus, which represents the actual liquid level.

Conclusion

For accurate liquid measurement in a graduated cylinder, it is essential to place the cylinder on a level surface and read the bottom of the meniscus. This method minimizes measurement errors and ensures consistency, which is critical in laboratory settings or any precise liquid measurement scenario.

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