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Vapor Pressure Lowering (Raoult Colligative) Calculator

ΔP = P° × x_solute — colligative lowering of solvent vapor pressure.

Calculates the vapor pressure lowering of a solvent when a non-volatile solute is added, using the mole fraction of solute and the pure solvent vapor pressure.

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Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

ΔP = P° × x_solute; P_solution = P° × (1 − x_solute)

In depth

Calculates the vapor pressure lowering of a solvent when a non-volatile solute is added, using the mole fraction of solute and the pure solvent vapor pressure.