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What is the formula for calculating the depression of freezing point?

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Question: What is the formula for calculating the depression of freezing point?

Options:

  1. ΔTf = Kf * m
  2. ΔTf = Kb * m
  3. ΔTf = R * T
  4. ΔTf = P * V

Correct Answer: ΔTf = Kf * m

Solution: 

The depression of freezing point is calculated using the formula ΔTf = Kf * m, where Kf is the freezing point depression constant and m is the molality of the solution.

What is the formula for calculating the depression of freezing point?

Practice Questions

Q1
What is the formula for calculating the depression of freezing point?
  1. ΔTf = Kf * m
  2. ΔTf = Kb * m
  3. ΔTf = R * T
  4. ΔTf = P * V

Questions & Step-by-Step Solutions

What is the formula for calculating the depression of freezing point?
  • Step 1: Understand that the depression of freezing point is how much the freezing point of a solution is lowered compared to the pure solvent.
  • Step 2: Learn the formula: ΔTf = Kf * m.
  • Step 3: Identify the variables in the formula: ΔTf is the change in freezing point, Kf is a constant specific to the solvent, and m is the molality of the solution.
  • Step 4: Find the value of Kf for the solvent you are using (this is usually provided in tables).
  • Step 5: Calculate the molality (m) of your solution, which is the number of moles of solute divided by the mass of solvent in kilograms.
  • Step 6: Multiply Kf by the molality (m) to find ΔTf, the depression of the freezing point.
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