How does the boiling point of a liquid evolve if a non-volatile solute is added?
Lowering the vapor pressure (e.g., by dissolving a non-volatile solute) raises the normal boiling point of any liquid.
The boiling point of a liquid are the conditions of temperature and pressure when the vapour pressure of the liquid becomes equal to the surrounding pressure, and bubbles of vapour form directly in the liquid. The normal boiling point is specified when the ambient pressure is
For example, the normal boiling point of water is
The reduction in vapor pressure means that the water (or any solvent) must be heated to a higher temperature to reach the point where the vapor pressure is once again equal to 1 atmosphere. Thus, the boiling point (temperature) is increased.