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A student put 25.0 cm³ of dilute hydrochloric acid into a conical flask. The student added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture: Which apparatus does the student need to use to obtain the most accurate results?
  1. Burette, Pipette, Thermometer
  2. Balance, Measuring Cylinder, Thermometer
  3. Balance, Pipette, Thermometer
  4. Balance, Pipette, Stopwatch
Explanation
  • To obtain accurate results, precise measurement of mass and volume is essential.
  • A balance is used to measure 2.5 g sodium carbonate accurately.
  • A pipette measures 25.0 cm³ acid more accurately than a measuring cylinder.
  • A thermometer is needed to record temperature change.
  • Therefore, these three give the most accurate results.

Last verified on 12-04-2026

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