Standard titration apparatus for volume measurement

Steps:

• Pipette delivers a precise, fixed volume of sodium hydroxide (25 cm³) into the conical flask.
• Add indicator to the flask for endpoint detection.
• Burette dispenses variable volumes of dilute hydrochloric acid incrementally.
• Record the burette reading at the endpoint to determine acid volume used.

Why B is correct:

• In acid-base titration, the pipette measures the exact volume of the base (analyte), while the burette allows precise control and measurement of the acid (titrant) volume added.

Why the others are wrong:

• A: Sodium hydroxide is pipetted, not measured with a burette, which is for the titrant.
• C: Hydrochloric acid requires a burette for variable dispensing, not a fixed-volume pipette.
• D: Beaker lacks precision for measuring sodium hydroxide; acid also needs a burette, not a pipette.

Final answer: B