Raoult's Law Calculator
Find the vapor pressure lowering of a solution.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
Raoult's law states that the vapor pressure of a solvent above an ideal solution equals the vapor pressure of the pure solvent multiplied by its mole fraction in the solution: P = x·P₀. Because adding a solute always lowers the solvent's mole fraction below 1, dissolving something in a liquid always lowers its vapor pressure — one of the four classic colligative properties, alongside boiling-point elevation, freezing-point depression, and osmotic pressure.
Chemists and chemical engineers use Raoult's law to predict vapor-liquid equilibrium in distillation columns, to model how antifreeze or dissolved salts change a solution's evaporation behavior, and as the baseline "ideal" case against which real (non-ideal) mixtures with positive or negative deviations are measured. Enter the solvent's mole fraction and its pure vapor pressure to find the vapor pressure above the solution.
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