In this laboratory setup for distillation, where does the vaporization take place?
Correct answer: D. In the heated flask
- A. Around the thermometer
- B. In the condenser
- C. In the circulating water
- D. In the heated flask
Explanation
Distillation is described as a two-step process: Vaporization → Condensation. For vaporization to happen, you need a heat source. In a laboratory, this heat is applied directly to the round-bottom flask containing your mixture. As the liquid reaches its boiling point, it turns into vapor and rises. The rest of the equipment is simply there to guide that vapor (distillation head), measure it (thermometer), and cool it back down (condenser) so you can collect it as a pure liquid in the receiving flask.
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About Experimental Techniques in Chemistry
Separation methods are selected according to differences in solubility, particle size, volatility and sublimation behaviour. Filtration and crystallisation separate insoluble or dissolved solids, sublimation isolates suitable volatile solids, distillation separates liquids by boiling point, and solvent extraction transfers a substance between immiscible solvents.
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