1. What is Activity Coefficient for Infinite Dilution?

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.

2. How Does the Calculator Work?

The calculator uses the Wilson equation formula:

Where:

• γ₁^∞ — Activity coefficient for component 1 at infinite dilution
• Λ₁₂ — Wilson equation coefficient for component 1 in binary system
• Λ₂₁ — Wilson equation coefficient for component 2 in binary system

Explanation: The natural logarithm of Λ₁₂ is subtracted from 1 and then Λ₂₁ is subtracted to get the activity coefficient.

3. Importance of Activity Coefficient Calculation

Details: Accurate activity coefficients are essential for predicting phase equilibria, designing distillation columns, and modeling chemical processes.

4. Using the Calculator

Tips: Enter the Wilson coefficients Λ₁₂ and Λ₂₁. Typical values range between 0 and 1, but must be greater than 0.

5. Frequently Asked Questions (FAQ)

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.