Question 39

Accurate volumetric measurement of a solution in a graduated cylinder is indicated by the bottom of the meniscus.

The bottom of the meniscus is the correct indicator for an accurate volumetric measurement in a graduated cylinder. This is because the curvature of the liquid surface, known as the meniscus, creates a point of reference for precise measurement.

A) Top of the meniscus

Using the top of the meniscus for measurement is incorrect as it does not provide an accurate reflection of the liquid's volume. The top of the meniscus can be influenced by surface tension and may not align with the true volume level, leading to measurement errors.

B) Error of parallax

The error of parallax refers to the misreading that occurs when the measurement is viewed at an angle rather than straight on. While this concept is relevant to measurement accuracy, it does not indicate the correct point on the meniscus for volumetric measurement, making this option incorrect.

C) Surface tension force

Surface tension force affects the shape of the meniscus but does not determine the accurate measurement of the liquid volume. Therefore, this choice does not relate directly to the correct method of measurement and is not a valid option.

D) Bottom of the meniscus

The bottom of the meniscus is the correct point for taking a reading in a graduated cylinder. This is where the liquid level is most accurately represented, allowing for precise volumetric measurements.

Conclusion

The bottom of the meniscus is the definitive point for accurate volumetric measurement in a graduated cylinder, as it reflects the true level of the liquid. All other options either misrepresent the correct measurement point or pertain to factors that do not provide a valid answer to the question being asked. Thus, option D stands out as the only correct choice.