CH-455
Separation and purification
Chemistry · Secondary 3 · Hard · Separation and purification
A student separates a mixture of ethanol (b.p. 78 °C) and water (b.p. 100 °C) by simple distillation. The thermometer reading stays at 78 °C for several minutes before rising. Which statement explains this observation?
- Water is boiling and condensing at 78 °C.
- Ethanol is boiling and distilling over at its boiling point.
- Both ethanol and water are boiling at 78 °C.
- The thermometer is faulty and stuck at 78 °C.
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