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Solution Boiling Elevation, Molality & Particle Factor

Estimate ideal boiling-point elevation from solvent properties, molality and van’t Hoff factor, with corrected interval and reciprocal-mass units.

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

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Formula and method

Water with Kb = 0.512 K·kg/mol, molality 1 mol/kg and i = 2 has ideal elevation 1.024 K and boiling point 101.024°C at the reference pressure.

ΔTb = i Kb m; Tb,solution = Tb,solvent + ΔTb

Worked example

Enter these known values and leave the other values blank.

Solvents
Water
van't Hoff factor (i)
2
Boiling point of pure solvent (T_solvent)
100 °C
Ebullioscopic constant (K_b)
0.512 °C⋅ kg /mol
Molality (m)
1 mol / kg
Boiling point elevation (ΔT)
1.024 °C
Boiling point of solution (T_solution)
101.02 °C

Assumptions and limitations

  • Assumes a dilute solution with a nonvolatile solute. Use a positive effective particle factor; nonideal dissociation and activity effects can change actual results.
  • Molality is moles per unit mass of solvent. Changing kg to lb changes the denominator conversion; it does not turn molality into a mass.
  • Elevation is a temperature interval: 1 K equals 1°C of change or 1.8°F of change. The solution and solvent temperatures remain absolute readings.
  • Solvent presets are rounded reference values at their stated nominal boiling conditions. Use custom values at the relevant pressure. Zero molality gives zero elevation.

Common questions

What assumptions matter for this calculation?

Assumes a dilute solution with a nonvolatile solute. Use a positive effective particle factor; nonideal dissociation and activity effects can change actual results.

References

Bookify corrects molality to reciprocal mass units and temperature elevation to interval conversions, validates a positive particle factor, and accepts zero molality/elevation.

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