* Vapor Pressure: Vapor pressure is the pressure exerted by the vapor of a liquid in equilibrium with its liquid phase. It's a measure of how readily a liquid evaporates.
* Sugar as a Solute: Sugar is a non-volatile solute, meaning it doesn't easily evaporate. When you add sugar to water, the sugar molecules take up space at the surface of the solution.
* Reduced Evaporation: This means there are fewer water molecules at the surface to escape into the vapor phase. Consequently, the rate of evaporation decreases, and the vapor pressure of the solution is lower than that of pure water.
In summary: The presence of a non-volatile solute like sugar lowers the vapor pressure of a solution because it reduces the number of solvent molecules (water, in this case) that can escape into the vapor phase.
