O-LevelChemistryAcids, Bases & Salts5070/11 · May/June 2025 · Q381 Mark

A titration is completed. 25.0 cm³ of aqueous sodium hydroxide is added to a conical flask. A few drops of methyl orange indicator are added. Dilute hydrochloric acid is added slowly to the mixture until the colour changes. Which row is correct?

Avolumetric pipette | burette | red to orange

Bmeasuring cylinder | burette | red to orange

Cvolumetric pipette | burette | yellow to orange

Dvolumetric pipette | measuring cylinder | yellow to orange

✓ Correct answer

C: volumetric pipette | burette | yellow to orange

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2025 Paper 1 Variant 1, question 38.

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