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THE FEUTEX TOOLKIT

Colligative Temperature Shifts

Calculate ideal freezing-point depression and boiling-point elevation from molality.

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FormulaFreezing-point depression = i*kf*m; Boiling-point elevation = i*kb*m
Sources and model references

Worked example

Inputs

Solute molality
0.5 mol/kg
Effective van ’t Hoff factor
2
Freezing constant
1.86 K·kg/mol
Boiling constant
0.512 K·kg/mol

Expected results

Freezing-point depression
1.86 K
Boiling-point elevation
0.512 K

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Calculate ideal freezing-point depression and boiling-point elevation from molality.
  2. Set solute molality, effective van ’t hoff factor, freezing constant, boiling constant in the indicated units.
  3. Calculate and compare freezing-point depression, boiling-point elevation.

Try this example

{
  "m": 0.5,
  "i": 2,
  "kf": 1.86,
  "kb": 0.512
}

Accuracy and scope

Ideal dilute-solution approximation with user-supplied effective particle factor and solvent constants.

Is my data uploaded?

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