Total Pressure Formula:
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Definition: The total pressure of a mixture of immiscible liquids is the sum of their pure state vapor pressures since each liquid contributes independently to the total pressure.
Purpose: This calculation is important in chemical engineering and physical chemistry for systems where two liquids don't mix (like oil and water).
The calculator uses the formula:
Where:
Explanation: Since the liquids are immiscible, each exerts its own vapor pressure independently, and the total pressure is simply the sum of these individual pressures.
Details: Understanding this principle is crucial for distillation processes, vapor-liquid equilibrium calculations, and designing separation systems for immiscible liquids.
Tips: Enter the vapor pressures of both pure components in Pascals. The calculator will sum them to give the total pressure of the mixture.
Q1: Why do immiscible liquids follow this simple addition rule?
A: Because they don't mix, each liquid behaves as if the other weren't present, maintaining its own vapor pressure independently.
Q2: Does temperature affect this calculation?
A: Yes, but only indirectly - temperature affects the individual vapor pressures (P_A° and P_B°), which are your input values.
Q3: Can this be extended to more than two immiscible liquids?
A: Yes, for any number of immiscible liquids, the total pressure is the sum of all their individual vapor pressures.
Q4: How is this different from Raoult's Law?
A: Raoult's Law applies to miscible liquids where the vapor pressure depends on mole fraction. For immiscible liquids, mole fraction is effectively 1 for each component.
Q5: What are some real-world applications?
A: Steam distillation of essential oils, separation of organic compounds from water, and various industrial separation processes.