Boiling Point Elevation Formula

The boiling point elevation is a state in which the boiling point of the solution will be higher than the boiling point of the solvent. For instance, water has a boiling point of 100° C, it can be elevated by adding salt (solute) to it, in which the boiling point of the water + salt solution will be higher. This simple formula can be used to find the boiling point elevation of various solvents.

Formula:

ΔT = i Kb m

Where,
Kb = Constant (different for each solvent)
i = van't Hoff factor (mol particles / mol of solute)
m = molality

Substance Kb
benzene 2.53
camphor5.95
carbon tetrachloride5.03
ethyl ether2.02
water 0.52

The boiling point elevation is completely dependent on the presence of dissolved particles and their number. It is a colligative property of matter. It can be used to measure the degree of dissociation of a solute.


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