Boiling Point Elevation Calculator
ΔT = i·Kb·b, with the van 't Hoff factor made explicit.
Work out Boiling Point Elevation. ΔT = i·Kb·b, with the van 't Hoff factor made explicit. Free, with no account and nothing to download.
0.512 for water. It is a property of the solvent.
Particles per formula unit: 1 for sugar, 2 for NaCl, 3 for CaCl₂.
Boiling point (°C)
100.512
Raised by 0.512 °C
ΔT = i·K·b. The van 't Hoff factor is the part most often left at 1 by mistake: sodium chloride splits into two ions, so per mole it shifts the boiling point twice as far as sucrose does. Colligative properties count particles, not identity — which is why road salt works and why it is spread by mass rather than by chemistry.
How the Boiling Point Elevation Calculator works
A dissolved solute raises the boiling point in proportion to the number of particles it contributes. The van 't Hoff factor is the part most often left at 1 by mistake: sodium chloride splits into two ions and shifts the point twice as far per mole as sucrose does.
Also known as: ebullioscopic constant calculator · colligative properties calculator · delta t boiling point · how to calculate boiling point elevation
Frequently asked questions
How do I calculate boiling point elevation?
ΔT = i·Kb·b. For water Kb is 0.512 °C·kg/mol, so a 1 molal solution of a non-dissociating solute boils at 100.512 °C.
What is the van 't Hoff factor?
The number of particles a formula unit produces in solution: 1 for sugar, 2 for NaCl, 3 for CaCl₂. Colligative properties count particles, not identity.
Why does salting pasta water barely help?
Because the effect is small at culinary concentrations. A tablespoon of salt in four litres raises the boiling point by well under a tenth of a degree — the salt is for flavour.
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