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The formulas of boiling point elevation and freezing point depression

The boiling point of the solution is higher than that of the solvent. This is called boiling point elevation. Similarly, the freezing point of the solution is lower than that of the solvent. This is called freezing point depression.

The boiling point elevation or the freezing point depression can be calculated from the following formula.

⊿t = Km

⊿t : boiling point elevation (freezing point depression)
K : ebullioscopic constant (cryoscopic constant)
m : molar mass