Which of the following is NOT a reason for the experimental volume of a flask to be incorrect?

• A. Residual liquid left in the flask after emptying
• B. Parallax error when reading the meniscus
• C. Using a calibrated volumetric flask
• D. Temperature fluctuations during measurement

Answer: (C)

Verified step by step guidance

1. Step 1: Understand that the question asks which option is NOT a reason for an incorrect experimental volume measurement in a flask.
2. Step 2: Review each option to determine if it can cause volume measurement errors:
3. - Residual liquid left in the flask after emptying can cause the measured volume to be less than expected, leading to error.
4. - Parallax error when reading the meniscus can cause incorrect volume readings due to the observer's eye position.
5. - Temperature fluctuations during measurement can cause the liquid or flask to expand or contract, affecting volume accuracy.
6. Step 3: Recognize that using a calibrated volumetric flask is intended to improve accuracy, not cause errors, so it is NOT a reason for incorrect volume measurement.