What is the correct formula for calculating elevation in boiling point?

Boiling point elevation refers to the increase in the boiling point of a solvent upon the addition of a solute. When a non-volatile solute is added to a solvent, the resulting solution has a higher boiling point than that of the pure solvent.

Boiling Point Elevation Formula

The boiling point of a solution containing a non-volatile solute can be expressed as follows:

Boiling point of solution = boiling point of pure solvent + boiling point elevation (ΔTb)

The elevation in boiling point (ΔTb) is proportional to the concentration of the solute in the solution. It can be calculated via the following equation.

ΔTb = i*Kb*m


  • i is the Van’t Hoff factor
  • Kb is the ebullioscopic constant
  • m is the molality of the solute

The ebullioscopic constant (Kb) is often expressed in terms of oC/molal or oC.kg.mol-1.

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