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i dont understand the whole non-volatile and volatile solid additions to mixtures and why/how that affects vapor pressure and what we need to know about deviations from raolts law? please help
vapor pressure and deviations from raolt's law. someone please help explain this stuff.
- Thread starter mrh125
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Addition of solute to a pure solvent lowers the VP.
Why?
Think about what VP is dependent on.
Evaporation.
Evaporation is dependent on what?
The surface area of the solvent that is exposed. If the liquid is in a bottle and completely fills the volume of the bottle, no surface area is exposed to the atmosphere. So do you think there will be any evaporation? Do you think there will be any VP?
So if we add solute, what happens to the surface area of the solvent? Probably decreases, as the solute particles take up area too.
Why?
Think about what VP is dependent on.
Evaporation.
Evaporation is dependent on what?
The surface area of the solvent that is exposed. If the liquid is in a bottle and completely fills the volume of the bottle, no surface area is exposed to the atmosphere. So do you think there will be any evaporation? Do you think there will be any VP?
So if we add solute, what happens to the surface area of the solvent? Probably decreases, as the solute particles take up area too.
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