A student needs to measure exactly 25.0 mL of a liquid for a titration. Which piece of apparatus is most appropriate for this task?
Show the answer and explanation
Correct answer
B. A 25 mL volumetric pipette
Principle or equation
A volumetric pipette is designed to deliver a precise, fixed volume (e.g., 25.00 mL) with high accuracy, making it ideal for measuring an exact volume for titration.
Why this answer is correct
Measuring cylinders and beakers have lower accuracy. A burette is used to deliver variable volumes during a titration, not to measure a fixed initial volume. A volumetric pipette is calibrated to deliver a specific volume accurately, so it is the correct choice.
Example
To measure 25.0 mL of HCl for titration, use a 25 mL volumetric pipette, fill to the mark, and drain into the conical flask.
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