How does solubility affect boiling point?

1 Answer


The greater the solubility of a solute, the greater the boiling point.


Boiling point is a colligative property. It depends only on the numbers of particles in the solution, not on their identities.

The formula for boiling point elevation is

#ΔT_"b" = iK_"b"m#

If we have two comparable compounds, the more soluble compound will have more particles in solution.

It will have a higher molality.

The boiling point elevation, and hence the boiling point, will be higher for the more soluble compound.