Henry's Law Formula:
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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 helps quantify how much of a gas will dissolve in a liquid at a given pressure, important in environmental chemistry and chemical engineering.
The calculator uses the formula:
Where:
Explanation: The constant is calculated by dividing the partial pressure of the gas above the solution by the mole fraction of the gas dissolved in the liquid.
Details: This constant is crucial for understanding gas solubility in liquids, designing aeration systems, and studying environmental processes like gas exchange between atmosphere and water bodies.
Tips: Enter the partial pressure in Pascals and mole fraction (between 0 and 1). The mole fraction represents the ratio of moles of dissolved gas to total moles in solution.
Q1: What are typical units for Henry's Law Constant?
A: Common units are Pa·m³/mol, atm·m³/mol, or dimensionless depending on the form of Henry's Law used.
Q2: How does temperature affect Henry's Constant?
A: KH increases with temperature - gases become less soluble in liquids at higher temperatures.
Q3: What's a typical value for common gases?
A: For CO2 at 25°C it's about 0.034 mol/L·atm, while for O2 it's about 0.0013 mol/L·atm.
Q4: 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.
Q5: How is this different from solubility?
A: While related, solubility is typically expressed as concentration, while Henry's constant relates partial pressure to mole fraction.