Relationship between relative lowering in vapour pressure and molality
Answers
The boiling point elevation can be explained in terms of vapor pressure.
Vapour pressure is a measure of the tendency of the solution molecules to escape to gas phase. A liquid boils when its vapor pressure is equal to the surrounding pressure. The addition of a solute to a solvent dilutes the solution, and decreases the vapor pressure: the molecules escape into the environment more slowly. For the vapor pressure to exceed the external pressure a higher temperature is required; thus, a higher boiling point is observed.
In general, if something has a high vapor pressure, it is expected to have a low boiling point. If it has a low vapor pressure, it is likely to have a high boiling point.
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Answer:
As more solute is dissolved in the solvent, the vapor pressure of the solvent decreases, and the change in the vapor pressure of the solvent increases. ... In dilute solutions, the mole fraction of the solute is proportional to the molality of the solution,
