1. What is Concentration of Species in Aqueous Phase?

Definition: This calculator determines the concentration of a species in aqueous phase based on Henry's Law, which relates the concentration of a gas in a liquid to the partial pressure of that gas above the liquid.

Purpose: It's essential for environmental science, chemical engineering, and aquatic chemistry to understand gas solubility in water.

2. How Does the Calculator Work?

The calculator uses Henry's Law formula:

Where:

• \( c_a \) — Concentration in aqueous phase (mol/m³)
• \( H_{cp} \) — Henry's law constant (mol/(m³·Pa))
• \( P_{species} \) — Partial pressure of the species in gas phase (Pa)

Explanation: The concentration of a dissolved gas is proportional to the partial pressure of that gas above the solution.

3. Importance of Henry's Law Calculation

Details: This calculation is crucial for understanding gas exchange in natural waters, designing aeration systems, and predicting environmental fate of gases.

4. Using the Calculator

Tips: Enter Henry's solubility constant (specific to each gas-water system) and the partial pressure of the gas. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is Henry's law constant?
A: It's a proportionality constant that relates the concentration of a gas in solution to its partial pressure above the solution.

Q2: How does temperature affect Henry's constant?
A: Henry's constant typically decreases with increasing temperature, meaning gases become less soluble in warmer water.

Q3: What are typical units for Henry's constant?
A: Common units include mol/(m³·Pa), atm/(mol/L), or dimensionless forms depending on the definition used.

Q4: Does this work for all gases?
A: Henry's law works best for dilute solutions and gases that don't react chemically with the solvent.

Q5: Where can I find Henry's constants for different gases?
A: Chemical engineering handbooks and environmental chemistry references typically provide these values.