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What is the primary reason for the elevation of boiling point in a solution?

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Question: What is the primary reason for the elevation of boiling point in a solution?

Options:

  1. Increased molecular weight
  2. Decreased vapor pressure
  3. Increased solubility
  4. Decreased temperature

Correct Answer: Decreased vapor pressure

Solution: 

The elevation of boiling point occurs because the presence of solute lowers the vapor pressure of the solvent, requiring a higher temperature to reach boiling.

What is the primary reason for the elevation of boiling point in a solution?

Practice Questions

Q1
What is the primary reason for the elevation of boiling point in a solution?
  1. Increased molecular weight
  2. Decreased vapor pressure
  3. Increased solubility
  4. Decreased temperature

Questions & Step-by-Step Solutions

What is the primary reason for the elevation of boiling point in a solution?
  • Step 1: Understand that boiling point is the temperature at which a liquid turns into vapor.
  • Step 2: Know that a solution is made up of a solvent (like water) and a solute (like salt or sugar).
  • Step 3: Realize that when you add a solute to a solvent, it changes how the solvent behaves.
  • Step 4: Learn that the presence of the solute lowers the vapor pressure of the solvent.
  • Step 5: Understand that lower vapor pressure means the solvent needs to be heated to a higher temperature to boil.
  • Step 6: Conclude that this is why the boiling point of the solution is higher than that of the pure solvent.
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