If 1 kg of water is mixed with 1 kg of sugar, what is the expected change in boi

Practice Questions

Q1
If 1 kg of water is mixed with 1 kg of sugar, what is the expected change in boiling point? (2023)
  1. No change
  2. Increase
  3. Decrease
  4. Depends on the sugar type

Questions & Step-by-Step Solutions

If 1 kg of water is mixed with 1 kg of sugar, what is the expected change in boiling point? (2023)
  • Step 1: Understand that boiling point elevation occurs when a non-volatile solute (like sugar) is added to a solvent (like water).
  • Step 2: Recognize that the boiling point of pure water is 100 degrees Celsius at standard atmospheric pressure.
  • Step 3: Know that adding sugar to water will increase the boiling point of the mixture.
  • Step 4: Use the formula for boiling point elevation, which is ΔT = i * Kb * m, where ΔT is the change in boiling point, i is the van 't Hoff factor (which is 1 for sugar), Kb is the ebullioscopic constant for water, and m is the molality of the solution.
  • Step 5: Calculate the molality of the sugar solution by determining the number of moles of sugar in 1 kg of sugar and dividing by the mass of water in kg.
  • Step 6: Apply the values into the boiling point elevation formula to find the expected change in boiling point.
  • Boiling Point Elevation – The phenomenon where the boiling point of a solvent increases when a non-volatile solute is added.
  • Colligative Properties – Properties that depend on the number of solute particles in a solution, not the identity of the solute.
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