Calculadora de Pressão de Vapor (Raoult)

This calculator applies Raoult's Law to determine the vapor pressure of a solvent in an ideal solution. The formula used is P = x_A × P*_A, where x_A is the mole fraction of the solvent and P*_A is the vapor pressure of the pure solvent. The result shows the partial pressure of the solvent in the solution. Additionally, the calculator also displays the vapor pressure lowering, ΔP = (1 − x_A) × P*_A, which represents the difference between the vapor pressure of the pure solvent and that in the solution.

When to use this tool? In laboratory or chemical engineering settings, such as preparing solutions for distillation, studying colligative properties, or calculating vapor pressures in liquid mixtures. It is useful for students and professionals who need to predict solvent behavior in non-volatile solutions. For example, when dissolving a solute in water, the vapor pressure of water decreases, and this calculator quantifies that reduction.

Important precautions: Raoult's Law is valid only for ideal solutions, where interactions between solvent and solute molecules are similar to those between solvent molecules alone. For real solutions, especially with high solute concentrations or solutes that interact strongly with the solvent, deviations can be significant. Also, the mole fraction must be between 0 and 1; values outside this range yield invalid results. Ensure the vapor pressure of the pure solvent is in the same unit as desired for the result.