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Elevation in Boiling Point

When a liquid is heated then due to rise in temperature the liquid vapourises and the vapour pressure increases. When the vapour pressure of the liquid becomes equal to the atmospheric pressure, the liquid begins to boil. The temperature at which the equilibrium vapour pressure of the liquid becomes equal to the atmospheric pressure is called boiling point.

When a non volatile solute is added to the solvent the vapour pressure of the solvent in the solution decreases. Consequently the solution has to be heated to a higher temperature to have its vapour pressure equal to atmospheric pressure.

Consider the graph of vapour pressure verses temperature in Kelvin scale.

Chemistry Homework Help

If T0 is the boiling point of solvent and T1 is the boiling point of solution, then

DTb = Elevation in boiling point

= T1 - T0

Chemistry Help

DTb = Kb × m

Chemistry Project Help

Kb = Molal elevation constant

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