Chemistry XI Content
What happens to the vapour pressure of a solvent, when non volatile solute particles are dissolved in it?
A non-volatile solute particle lowers the vapour pressure of solvent because solute particles become surrounded by solvent particles when dissolved. This causes the particles of solvent to evaporate less because it requires more energy for the particles to do this since the solvent to solute attraction are strong. So the vapour pressure of a solution is less than that of the pure solvent.