Fractional vs. simple distillation
Two miscible liquids boil at 78 °C and 85 °C. What is the best way to separate them?
Answer A: explanation for every choice
A
Correct. The fractionating column provides repeated vaporization–condensation cycles that separate liquids with close boiling points.
B
Simple distillation works when boiling points differ by more than about 25 °C.
C
Vacuum distillation lowers boiling points for high-boiling or heat-sensitive compounds.
D
Filtration separates solids from liquids.
TakeawayClose boiling points → fractional distillation.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID cp49.