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Water boils at 100°C while ethanol boils at 78°C.When distilling a mixture of ethanol and water, which liquid would collect in the condenser first? Explain your answer.

Question

Water boils at 100°C while ethanol boils at 78°C.When distilling a mixture of ethanol and water, which liquid would collect in the condenser first? Explain your answer.

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Solution

The liquid that would collect in the condenser first would be ethanol. This is because ethanol has a lower boiling point than water.

Here's a step-by-step explanation:

  1. When you heat a mixture of water and ethanol, both substances start to get hot, but they do not boil at the same temperature.

  2. Ethanol boils at a lower temperature (78°C) compared to water (100°C). This means that ethanol will start to evaporate before water when the temperature reaches 78°C.

  3. As the ethanol evaporates, it will travel up into the condenser. The condenser is designed to cool down the vapor, turning it back into a liquid form.

  4. Therefore, the ethanol will be the first to condense into a liquid and be collected.

  5. The water will start to evaporate and condense once the temperature of the mixture reaches 100°C, which is after the ethanol has already been distilled.

So, in a distillation process of a mixture of water and ethanol, ethanol would be the first to be collected in the condenser due to its lower boiling point.

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