Question
Why does vapour pressure of a liquid decrease with addition of non-volatile solid solute?
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Answer
For a solution containing a non-volatile solute, there is no contribution of the solute to the total vapour pressure of the solution. Therefore, the vapour pressure of the solution will be the vapour pressure due to solvent only. Vapour Pressure of the Solution = Vapour Pressure of the Solvent in the Solution.
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