azeotropes

Question

An azeotropic mixture of ethanol and water boils at:

RankGuru · Accepted Answer

An **Azeotrope** is a 'constant boiling mixture' that has the same composition in the liquid and vapor phases.
- Ethanol and water form a **Minimum Boiling Azeotrope** at $95.6\%$ ethanol and $4.4\%$ water by mass.
- This mixture boils at **$78.17^\circ C$** (often rounded to $78.5^\circ C$), which is lower than the boiling points of both pure ethanol ($78.3^\circ C$) and pure water ($100^\circ C$). Because the composition does not change during boiling, they cannot be further separated by simple fractional distillation.

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More azeotropes Practice Questions

Minimum boiling azeotrope shows which deviation?