begin mathsize 48px style p equals x p to the power of o end style

p= Vapour Pressure of an Ideal Solution ; x= Mole Fraction of Solvent ; po =Vapour Pressure of the Pure Solvent ; 





Raoult's law applies to ideal solutions in which the solute is non-volatile. In such ideal solution the vapour pressure of the volatile solvent is equal to the product of the vapour pressure of the pure solvent (at the same temperature) and the mole fraction of the solvent. In simple words the non-volatile solute does not form a vapour and thus the decrease in vapour pressure depends the amount of solvent replaced by the solute (non-volatile). This chemistry calculator can be used to calculate the vapour pressure of such ideal solutions.

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