Boiling Point Elevation Calculator

Calculate the boiling point elevation when a solute is added to a solvent.

Boiling Point Elevation Calculator

Calculate the boiling point elevation when a solute is added to a solvent.

Formula
Delta Tb = i x Kb x m
What is This Tool?

Boiling point elevation is a colligative property: when a non-volatile solute dissolves in a solvent, the boiling point of the resulting solution is higher than that of the pure solvent. The elevation depends only on the number of solute particles, not their identity.

Formula
Delta Tb = i x Kb x m Where: i = Van't Hoff factor (number of particles per formula unit) Kb = ebullioscopic constant of the solvent m = molality (mol solute / kg solvent)
Worked Examples

1. Sugar in water

Given: i = 1, Kb = 0.512 C/m, m = 2 mol/kg, BP = 100 C

Delta Tb = 1 x 0.512 x 2 = 1.024 C

New BP = 100 + 1.024 = 101.024 C

Result: 101.024 C

2. NaCl in water

Given: i = 2 (Na+ and Cl-), Kb = 0.512, m = 1

Delta Tb = 2 x 0.512 x 1 = 1.024 C

New BP = 100 + 1.024 = 101.024 C

Result: 101.024 C

Frequently Asked Questions