The strength of an aqueous NaOH solution is most accurately determined by titrating: (Note: consider that an appropriate indicator is used)

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Step 1 — Principles of accurate titration:

For accurate titration:
- The standard solution (known concentration) should be in the burette or measured by pipette.
- The analyte (unknown) should be in the conical flask.
- The primary standard should be used to standardise the solution.

Step 2 — Evaluate each option:

(1) NaOH in pipette, oxalic acid in burette: NaOH is the analyte (unknown), so it should be in the flask, not the pipette. Oxalic acid (primary standard) should be in the flask. Inc

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