1. What is Henry's Law Constant?

Definition: Henry's Law Constant (K_H) is a measure of the concentration of a chemical in air over its concentration in water at equilibrium.

Purpose: It's used to predict the partitioning behavior of volatile compounds between gas and liquid phases in environmental and chemical engineering applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( K_H \) — Henry's Law Constant (Pa·m³/mol)
• \( y_{Gas} \) — Mole fraction of component in vapor phase
• \( P_T \) — Total pressure of gas (Pa)
• \( x_{Liquid} \) — Mole fraction of component in liquid phase

Explanation: The constant relates the gas-phase concentration to the liquid-phase concentration at equilibrium.

3. Importance of Henry's Law Constant

Details: This constant is crucial for understanding gas solubility, designing absorption/stripping processes, and environmental fate modeling of volatile compounds.

4. Using the Calculator

Tips: Enter the mole fraction in vapor phase (0-1), total gas pressure in Pascals (>0), and mole fraction in liquid phase (0-1). All values must be valid.

5. Frequently Asked Questions (FAQ)

Q1: What are typical units for Henry's Law Constant?
A: Common units include Pa·m³/mol, atm·m³/mol, or dimensionless ratios depending on the form of Henry's Law used.

Q2: How does temperature affect K_H?
A: K_H generally increases with temperature as gas solubility decreases.

Q3: What's a typical value range for K_H?
A: Values range widely - from ~10^-3 Pa·m³/mol for highly soluble gases to >10⁵ for poorly soluble ones.

Q4: When would I need to calculate K_H?
A: When designing gas-liquid contactors, modeling atmospheric exchange, or predicting volatile organic compound partitioning.

Q5: How accurate is this calculation?
A: It provides an ideal value; real systems may deviate due to non-ideal behavior, especially at high concentrations.