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IB Biology Exam Prep

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A laboratory investigation requires students to dispense 5 mL of a 1 molar sodium chloride solution. Which of the following pieces of laboratory glassware should the students use to achieve the most precise measurement?
  1. 5 mL graduated beaker.
  2. 10 mL graduated cylinder.
  3. 15 mL graduated conical flask.
  4. 20 mL graduated test tube.
Explanation
Correct Response: B. While all the glassware listed can be used to measure liquids, the 10 mL graduated cylinder would be the best choice for this application. This is because the measurement markings of the graduated cylinder are more accurate than those of the beaker (A) and conical flask (C). Also, compared to the graduated test tube (D), the volume of the graduated cylinder is much closer to the volume of solution to be dispensed. Selecting glassware with a volume close to the desired volume increases the precision of the measurement.
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