Freezing Point Depression Calculator

Calculate freezing point depression of solutions. Input molality and freezing point depression constant to find the change in freezing point.

Calculator

Molality of the solution in mol/kg

Kf value for the solvent in °C·kg/mol

Freezing point of the pure solvent

Results

Enter values and click Calculate to see results

About Freezing Point Depression

Freezing point depression is a colligative property that occurs when a non-volatile solute is added to a solvent, lowering its freezing point.

Formula:

ΔTf = Kf × m

Where:

  • ΔTf is the freezing point depression in °C
  • Kf is the freezing point depression constant in °C·kg/mol
  • m is the molality of the solution in mol/kg

Common Kf Values:

  • Water: 1.86 °C·kg/mol
  • Benzene: 5.12 °C·kg/mol
  • Ethanol: 1.99 °C·kg/mol
  • Acetic acid: 3.90 °C·kg/mol

Applications:

  • Antifreeze solutions
  • Road salt for ice melting
  • Food preservation
  • Industrial processes
  • Laboratory procedures