Elevation in boiling point is defined as the elevation in boiling point of water on addition of a solute. The elevation in boiling point (ΔTb ) depends on the molality of solute particles (m) and boiling point constant (Kb ). It is given by,
ΔTb = i m Kb
where, i is the Van't Hoff factor which is defined as the concentration of the particles formed when the solute is dissolved in solution to the concentration of the solute calculated from its mass. It is used to express the association or dissociation of substance in solution. Thus, Van't Hoff factor (i) is also defined as the number of particles dissociated on dissolving a solute .
From the above relation for constant molality and boiling point constant, elevation in boiling point increases with increase in Van't Hoff factor.
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