What happens to the vapor pressure of the volatile solvent when a nonvolatile solute is dissolved into it?

What happens to the vapour pressure when a volatile solute dissolves in the liquid b the dissolved solute is non volatile

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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.

Vapour pressure depends on

  • Nature of liquid
  • Temperature
  • Presence of impurities

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