A student needs to transfer exactly 25.0 mL of a dilute hydrochloric acid solution from a beaker into a conical flask for a titration. Which piece of apparatus is most appropriate for this task?
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Correct answer
A. Volumetric pipette
Principle or equation
A volumetric pipette delivers a fixed, precise volume (e.g., 25.0 mL) and is used for accurate transfer of liquids in titrations. A measuring cylinder is less precise, a burette is for dispensing variable volumes, and a beaker is not for accurate volume measurement.
Why this answer is correct
The task requires transferring an exact volume (25.0 mL) with high accuracy. A volumetric pipette is calibrated to deliver a specific volume precisely, making it the correct choice. A measuring cylinder has lower precision, a burette is used to add variable volumes during titration, and a beaker has graduation marks that are not accurate enough for precise transfer.
Example
In a titration, a 25.0 mL volumetric pipette is commonly used to transfer the analyte solution into the conical flask.
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