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According to Raults law, adding a solute to solvent decreases vapor pressure. Why is this?

April 26, 2017Chemistry Law Mathematics solute solvent

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According to Raults law, adding a solute to solvent decreases vapor pressure. Why is this?

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The pure solvent has plenty of “space” between the particles. Now when you add the [nonvolatile] solute, the solute will occupy those spaces. Without the solute, the vapors of the solvent will escape faster. If you put the solute in, the vapors of the solvent will take some time to escape.