1. What is Henry's Law Constant?

Definition: Henry's Law Constant is the ratio of a compound's partial pressure in vapor phase to the concentration of the compound in liquid phase at a given temperature.

Purpose: It helps quantify the solubility of gases in liquids and is widely used in environmental chemistry, chemical engineering, and atmospheric sciences.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( H_A \) — Henry's Law Constant (mol/m³·Pa)
• \( p_A \) — Partial Pressure of Reactant A (Pa)
• \( C_A \) — Reactant Concentration (mol/m³)

Explanation: The partial pressure of the gas is divided by its concentration in the liquid phase to determine the Henry's Law constant.

3. Importance of Henry's Law Constant

Details: This constant is crucial for understanding gas solubility, designing gas-liquid separation processes, and modeling environmental fate of volatile compounds.

4. Using the Calculator

Tips: Enter the partial pressure in Pascals and concentration in mol/m³. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical units for Henry's Law constant?
A: Common units are mol/m³·Pa, though atm·m³/mol is also used (different form of the law).

Q2: How does temperature affect Henry's constant?
A: Generally, the constant increases with temperature as gas solubility decreases.

Q3: What's a typical value for common gases?
A: For CO₂ at 25°C it's about 3.3×10⁻⁴ mol/m³·Pa, while for O₂ it's about 1.3×10⁻⁵ mol/m³·Pa.

Q4: When would I need to calculate this constant?
A: When designing aeration systems, studying gas exchange in water bodies, or modeling chemical processes.

Q5: Can this be used for any gas-liquid system?
A: It works best for dilute solutions where the gas doesn't react with the solvent.