Activity Coefficient Formula:
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Definition: The activity coefficient at infinite dilution (γ1∞) measures how much a component deviates from ideal behavior when it is infinitely diluted in a solvent.
Purpose: It's crucial in chemical engineering for designing separation processes and understanding mixture thermodynamics.
The calculator uses the Wilson equation formula:
Where:
Explanation: The natural logarithm of Λ12 is subtracted from 1 and then Λ21 is subtracted to get the activity coefficient.
Details: Accurate activity coefficients are essential for predicting phase equilibria, designing distillation columns, and modeling chemical processes.
Tips: Enter the Wilson coefficients Λ12 and Λ21. Typical values range between 0 and 1, but must be greater than 0.
Q1: What does infinite dilution mean?
A: Infinite dilution refers to the condition where the concentration of the solute approaches zero in the solvent.
Q2: How are Wilson coefficients determined?
A: Wilson coefficients are typically determined from experimental vapor-liquid equilibrium data.
Q3: What's the physical significance of activity coefficient?
A: It quantifies how much a component's chemical potential deviates from ideal solution behavior.
Q4: Can this be used for multicomponent systems?
A: The Wilson equation can be extended to multicomponent systems, but this calculator is for binary systems.
Q5: What does γ1∞ = 1 mean?
A: A value of 1 indicates ideal behavior at infinite dilution, while values >1 or <1 indicate positive or negative deviations from ideality.