O Levels Chemistry (5070)•5070/12/O/N/22
Explanation
Precision for Exact Volume Delivery
Steps:
- Require apparatus for exact 30.0 cm³ (0.1 cm³ precision) of liquid.
- Assess graduations: burette offers 0.1 cm³ scale for variable volumes.
- Evaluate delivery: burette allows controlled, accurate dispensing.
- Compare alternatives: others lack fine control or adjustability.
Why A is correct:
- A burette is graduated in 0.1 cm³ intervals and enables precise, variable volume delivery up to its capacity, per standard lab glassware design.
Why the others are wrong:
- B: A 50 cm³ pipette delivers only a fixed 50 cm³ volume, not adjustable to 30.0 cm³.
- C: A 50 cm³ syringe lacks fine chemical-lab calibrations for 0.1 cm³ accuracy.
- D: A 50 cm³ measuring cylinder uses 1 cm³ graduations, too coarse for 0.1 cm³ precision.
Final answer: A
Topic: Experimental design
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