This document discusses the colligative property of boiling point elevation. It defines boiling point as the temperature at which the vapor pressure of a liquid equals atmospheric pressure. When a non-volatile solute is added to a solvent, its boiling point increases from the original boiling point. This elevation in boiling point (ΔTb) is directly proportional to the molarity of the solution, as shown by the equation ΔTb = Kb × m, where Kb is the ebullioscopic constant specific to the solvent and m is the molality of the solution. The increased boiling point is due to the solute particles interfering with the vaporization of the solvent molecules.

1. Elevation of Boiling point
Designed by:
M. Abdul Manan
M.Faheem Abbas

2. Elevation of Boiling Point(2nd
Colligative property)
Colligative Property:
 Colligative properties of solutions are
properties that depend upon the
concentration of solute molecules
or ions, but not upon the identity of the
solute.
 Colligative properties include vapor
pressure lowering, boiling point
elevation, freezing point depression,
and osmotic pressure.

3. Elevation of Boiling Point
Boiling point:
The constant temp. at which thee vapor
pressure of liquid becomes equal to
the atmospheric pressure.
Boiling point of water :
100C

4. Elevation of boiling point
 Elevation of boiling point:
The boiling point of solvent elevate from
its original boiling point, when we add
a non volatile solute in it.
For example:
 If we add Wb amount of solute in Wa
amount of solution, the boilng point
increase to some extent from its
original boiling point.

6. Elevation of Boiling point
 For example:
Tb = T(solution) – T(solvent)

7. Elevation of boiling point
 ΔTb = Kb · m
 where
 ΔTb is the boiling point elevation
 Kb is the ebullioscopic constant, which
depends on the solvent
 m is the molality of the solution
(typically found in a table)

8. Determination of molar mass of
solute.
Molality:
the number of moles of solute dissolve
in a given mass of the solvent
expressed in Kg

9. Determination
b
b
b b
bb
b Boiling point
Boiling pointb

10. Any question
Elevation of boiling point

11. Elevation of boiling point
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