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Calcimator

Boiling Point Elevation

Calculate the boiling point elevation of a solution from the ebullioscopic constant, molality, and van't Hoff factor.

Inputs

°C/m
mol/kg

Results

Boiling Point Elevation (ΔTb)

0.512 °C

New Boiling Point

100.512 °C

Effective Particle Molality1 mol/kg
How to Use This Calculator
  1. Enter the ebullioscopic constant (Kb) for your solvent — water is 0.512 °C·kg/mol.
  2. Set solality in mol/kg and van't Hoff factor (i) for the solute (1 for non-electrolytes, 2 for NaCl, etc.).
  3. Enter the normal boiling point of the pure solvent.
  4. Review Boiling Point Elevation (ΔTb) and New Boiling Point.

How the result changes with Ebullioscopic Constant (Kb)

Ebullioscopic Constant (Kb)Boiling Point Elevation (ΔTb)New Boiling Point
1010 °C110 °C
3535 °C135 °C
6565 °C165 °C
9090 °C190 °C

What each input means

Ebullioscopic Constant (Kb)
Boiling point elevation constant for the solvent (water Kb = 0.512 °C·kg/mol)
Molality
Moles of solute per kilogram of solvent
van't Hoff Factor (i)
Number of particles per formula unit in solution (NaCl = 2, CaCl₂ = 3, sugar = 1)
Normal Boiling Point
Boiling point of the pure solvent (water = 100 °C)

How this is calculated

Formula

ΔTb = i × Kb × m

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Ebullioscopic Constant (Kb) = 0.512, Molality = 1, van't Hoff Factor (i) = 1, Normal Boiling Point = 100 = 4 input(s) provided
  2. Calculate Boiling Point Elevation
    Boiling Point Elevation
    0.512 = 0.512
  3. Calculate New Boiling Point
    New Boiling Point
    100.512 = 100.512
  4. Calculate Effective Particle Molality
    Effective Particle Molality
    1 = 1

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