Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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Why Does a Solution Containing Non-volatile Solute Have Higher Boiling Point than the Pure Solvent ? - Chemistry

Why does a solution containing non-volatile solute have higher boiling point than the pure solvent ?

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Solution

Boiling point is the temperature at which the vapour pressure of a substance becomes equal to the atmospheric pressure. According to Raoult's law, the vapour pressure of a solvent decreases in the presence of a non-volatile solute. Thus, the vapour pressure of a solution containing a non-volatile solute requires a high temperature to become equal to the atmospheric pressure. That is why the boiling point of a solution containing a non-volatile solute increases. Thus, the solution containing a non-volatile solute has a higher boiling point than a pure solvent.

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