CH-525
Separation and purification
Chemistry · Secondary 3 · Medium · Separation and purification
A student heats a mixture of ethanol (b.p. 78 °C) and water (b.p. 100 °C) in a distillation set‑up to obtain pure ethanol. As distillation proceeds, how does the concentration of ethanol in the distillation flask change with time?
- It decreases continuously with time.
- It increases continuously with time.
- It stays constant with time.
- It first decreases then increases with time.
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