A solute added to a solvent raises the boiling point of the solution because the solute particles raise the solvent's vapor pressure.
The boiling point of a solution is the temperature at which the pressure exerted by the surrounding of the solution is equal to the pressure exerted by the vapour or the solution itself.
The addition of solute to a solvent, the solute particles raise the solvent's vapor pressure, thus requiring a higher temperature to cause boiling.
Therefore, a solute added to a solvent raises the boiling point of the solution because the solute particles raise the solvent's vapor pressure.
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