Calculateur d'Abaissement du Point de Congélation
Calculez l'abaissement cryoscopique d'une solution.
C-kg/mol
m
C
Freezing Point Depression
1.860 C
New Freezing Point-1.860 C
Freezing Point Depression vs Cryoscopic Constant (Kf)
Formule
## How to Calculate Freezing Point Depression ### Formula **delta_Tf = i × Kf × m** For water, Kf = 1.86 C-kg/mol. New FP = pure FP - delta_Tf.
Exemple Résolu
0.5 m NaCl (i=2) in water.
- 01delta_Tf = 2 × 1.86 × 0.5 = 1.86 C
- 02New FP = 0 - 1.86 = -1.86 C
Questions Fréquentes
What is freezing point depression?
A colligative property where dissolving a solute lowers the freezing point. This is why salt is spread on icy roads.
Why is Kf larger than Kb for water?
The enthalpy of fusion is smaller than the enthalpy of vaporization, making freezing point more sensitive to solute.
Does this work for all solvents?
Yes, but each has its own Kf. Cyclohexane Kf = 20.0, making it useful for precise molar mass determinations.
Apprendre