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Definition: Saturated Pressure in Raoult's Law is the pressure at which a given liquid and its vapour or a given solid and its vapour can co-exist in equilibrium, at a given temperature.
Purpose: This calculator helps determine the saturated pressure of a component using the K-value expression for modified Raoult's Law.
The calculator uses the formula:
Where:
Explanation: The K value multiplied by total pressure gives an intermediate value which is then divided by the activity coefficient to account for deviations from ideal behavior.
Details: Accurate calculation of saturated pressure is crucial for phase equilibrium calculations, distillation column design, and other chemical engineering applications.
Tips: Enter the K value, total pressure in Pascals, and activity coefficient. All values must be > 0.
Q1: What is the K value in this context?
A: The K value is defined as the ratio of vapor-phase mole fraction to the liquid phase mole fraction.
Q2: What units should be used for pressure?
A: The calculator uses Pascals (Pa) for both total pressure and saturated pressure.
Q3: What does the activity coefficient represent?
A: The activity coefficient accounts for deviations from ideal behavior in a mixture of chemical substances.
Q4: When would I need to calculate saturated pressure?
A: This calculation is essential for vapor-liquid equilibrium problems, particularly when dealing with non-ideal solutions.
Q5: How accurate is this calculation?
A: The accuracy depends on the accuracy of your input parameters, particularly the activity coefficient which can vary with composition and temperature.