Henry Law Constant Formula:
From: | To: |
Definition: Henry's Law Constant (KH) 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.
The calculator uses the formula:
Where:
Explanation: The constant relates the gas-phase concentration to the liquid-phase concentration at equilibrium.
Details: This constant is crucial for understanding gas solubility, designing absorption/stripping processes, and environmental fate modeling of volatile compounds.
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.
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 KH?
A: KH generally increases with temperature as gas solubility decreases.
Q3: What's a typical value range for KH?
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 KH?
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.