Quantitative Treatment of VP Lowering
Raoult’s Law (vapor pressure of a solvent above a solution, Psolvent)
Psolvent = csolvent x Posolvent
where Posolvent = vapor pressure of the pure solvent
Posolvent - Psolvent = DP = csolute x Posolvent
How does the amount of solute affect the magnitude of the VP lowering?
( substitute 1- csolute for csolvent in the above equation and rearrange)
(change in VP is proportional to the mole fraction of solute)
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