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Definition: This calculator determines the ratio of partial vapour pressures of two immiscible liquids based on their weights and molecular masses.
Purpose: It helps chemists and chemical engineers understand the relative volatility of immiscible liquid mixtures.
The calculator uses the formula:
Where:
Explanation: The ratio of vapour pressures is directly proportional to the ratio of the products of weights and molecular masses of the opposite components.
Details: Understanding this ratio is crucial for distillation processes, predicting boiling points of mixtures, and designing separation systems.
Tips: Enter the weights and molecular masses of both liquids. All values must be > 0. The calculator provides the pressure ratio with high precision (6 decimal places).
Q1: What are immiscible liquids?
A: Immiscible liquids are those that don't mix to form a homogeneous solution (like oil and water).
Q2: Why does the molecular mass affect vapour pressure?
A: Heavier molecules generally have lower vapour pressures as they require more energy to escape the liquid phase.
Q3: Can this be used for miscible liquids?
A: No, this formula specifically applies to immiscible liquid mixtures.
Q4: What does a ratio > 1 indicate?
A: It means liquid A has a higher partial vapour pressure than liquid B in the mixture.
Q5: How is this related to Raoult's Law?
A: This is a special case for immiscible liquids, where each liquid contributes independently to the total vapour pressure.