Question

Why does the boiling point of a solvent increase by the presence of a solute in it?

Answer 1

1. The boiling point of a solvent increases when a non-volatile solute is added because the vapour pressure of the solution becomes lower than that of the pure solvent.
2. As a result, a higher temperature is required for the solution’s vapour pressure to equal atmospheric pressure, causing a boiling point elevation.
3. This phenomenon is a colligative property and depends on the number of solute particles, not their nature.