Freezing Point Calculator

Calculate freezing point depression using colligative properties. Determine how adding a solute affects the freezing point of a solvent.

Freezing Point Calculator

About Freezing Point Depression

Formula

ΔTf = i × Kf × m

Where ΔTf = freezing point depression, i = van't Hoff factor, Kf = cryoscopic constant, m = molality

Selected Solvent

Water (H₂O)
Kf = 1.86 °C/m
Normal FP = 0°C

How to Use

  1. Select the solvent from the dropdown
  2. Choose the solute type (electrolyte vs non-electrolyte)
  3. Enter the molality of the solution
  4. For custom solutes, enter the van't Hoff factor
  5. Click Calculate to get the freezing point depression

Van't Hoff Factor (i)

  • Non-electrolytes: i = 1 (e.g., glucose, sucrose)
  • Strong electrolytes: i = number of ions (e.g., NaCl → i = 2)
  • Weak electrolytes: i = 1-2 (partial dissociation)
  • Custom: Enter specific value for complex solutes

Applications

  • Antifreeze solutions
  • Ice cream making
  • Road salt applications
  • Colligative property studies
  • Laboratory experiments

Important Notes

  • Molality is independent of temperature
  • Assumes ideal solution behavior
  • Works best for dilute solutions
  • Temperature must be in Celsius
  • Kf values are solvent-specific