College of Pharmacy Organic Chemistry Experiment 4: Distillation

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Questions and Answers

What is the purpose of steam distillation?

  • To cool down the mixture
  • To increase the temperature of the mixture
  • To separate heat-sensitive components in a mixture (correct)
  • To increase the pressure of the mixture

How are vapours collected in the distillation process?

  • By decreasing the surrounding temperature
  • By cooling the mixture rapidly
  • By increasing the pressure around the mixture
  • By passing steam through the mixture (correct)

In vacuum distillation, why are high-purity samples obtained?

  • Because compounds decompose at high temperatures (correct)
  • Because compounds decompose at low temperatures
  • Due to increased temperature during distillation
  • Due to increased surrounding pressure

Why is steam used in steam distillation instead of direct heating?

<p>Direct heating damages heat-sensitive components (C)</p> Signup and view all the answers

What is the main purpose of using fractional distillation?

<p>To separate liquids with similar boiling points (C)</p> Signup and view all the answers

What happens when the vapour pressure of a component equals the surrounding pressure?

<p>The component evaporates into a gas (D)</p> Signup and view all the answers

How does a fractionating column aid in fractional distillation?

<p>By allowing for multiple vaporization-condensation cycles (D)</p> Signup and view all the answers

Why is vacuum distillation used for separating mixtures with very high boiling points?

<p>To decrease the pressure in order to lower boiling temperatures (C)</p> Signup and view all the answers

What is a common application of fractional distillation in industries?

<p>Separating components of crude oil like gasoline and diesel (C)</p> Signup and view all the answers

How does fractional distillation compare to simple distillation in terms of effectiveness?

<p>Fractional distillation is more effective when boiling points are close (B)</p> Signup and view all the answers

What role does a condenser play in the distillation process?

<p>Condensing vapors back into liquid form for collection (A)</p> Signup and view all the answers

What is the principle behind distillation?

<p>Difference in boiling points of liquids (C)</p> Signup and view all the answers

Which type of distillation involves heating the liquid mixture to its boiling point and immediately condensing the resulting vapors?

<p>Simple distillation (A)</p> Signup and view all the answers

What is the minimum difference in boiling points required for simple distillation to be effective?

<p>25°C (D)</p> Signup and view all the answers

In the distillation process, which component evaporates faster if the boiling point difference is considerable?

<p>The more volatile component (A)</p> Signup and view all the answers

How does a condenser contribute to the distillation process?

<p>It aids in condensing the vapors back into liquid form (A)</p> Signup and view all the answers

Which pair of compounds can be effectively separated by simple distillation?

<p>Acetone (boiling point 56°C) and Benzene (boiling point 80°C) (B)</p> Signup and view all the answers

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