Accurate Titration Setup with Methyl Orange Indicator

Steps:

• Measure 25 cm³ NaOH precisely using a volumetric pipette for the fixed volume in the flask.
• Add dilute HCl from a burette to allow controlled, accurate volume measurement during titration.
• Add methyl orange indicator, which appears yellow in alkaline NaOH solution.
• Titrate until color changes from yellow (alkaline) to orange (neutral endpoint).

Why C is correct:

• Volumetric pipette ensures exact 25 cm³ NaOH; burette allows precise HCl addition; methyl orange shifts yellow to orange at equivalence point per standard indicator behavior.

Why the others are wrong:

• A: Color change is yellow to orange, not red to orange (red occurs in acidic conditions post-endpoint).
• B: Measuring cylinder lacks precision for 25 cm³ NaOH compared to volumetric pipette.
• D: Measuring cylinder cannot deliver precise variable HCl volumes like a burette.

Final answer: C