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2018 O Level Chem P1 Q4 — Experimental Techniques / Titration Apparatus Solution

Experimental Techniques / Titration Apparatus 2018 O Level Pure Chemistry · Paper 1 · Q4

Question

An experiment is done to determine the rate of reaction of an ester with sodium hydroxide. CH₃CO₂C₂H₅ + NaOH → CH₃CO₂Na + C₂H₅OH Samples are withdrawn at intervals and titrated against hydrochloric acid to find the amount of sodium hydroxide remaining. As well as the conical flask, what other apparatus is needed for the titration?

Abalance, stop clock, gas syringe
Bmeasuring cylinder, gas syringe, thermometer
Cpipette, balance, thermometer
Dpipette, burette

Correct answer: D

Video Solution

Explanation

Answer: D (pipette, burette). A titration transfers a precise fixed volume of one solution into the conical flask using a pipette, then adds the second solution from a burette until the end-point is reached.

The pipette delivers the fixed aliquot; the burette delivers the measured variable volume to the end-point. No thermometer, gas syringe, balance or measuring cylinder is needed for a standard acid-base titration.

Only option D lists exactly the pipette and burette. Answer D.

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