What is the Gas Solubility Calculator?

This Gas Solubility Calculator uses Henry’s Law to determine the concentration of a gas dissolved in a liquid at a constant temperature. According to Henry’s Law, the amount of dissolved gas is directly proportional to its partial pressure above the liquid. This tool is essential for chemists, environmental scientists, and homebrewers who need to understand how gases interact with fluids under various atmospheric conditions.

How to Calculate Gas Solubility Using Henry's Law

The formula for Henry's Law is expressed as: C = kH × P

• C: The concentration of the dissolved gas (usually in mol/L).
• kH: The Henry’s Law constant, which is specific to each gas-solvent pair and depends on temperature.
• P: The partial pressure of the gas above the solution (measured in atm).

To use this calculator, simply select a common gas from the dropdown menu to auto-fill the constant, or enter your own specific constant. Input the partial pressure, and the tool will instantly compute the molar solubility.

Factors Affecting Gas Solubility

Several factors influence how much gas can dissolve in a liquid. The most critical factor is temperature; unlike solids, the solubility of gases typically decreases as the temperature of the liquid increases. This is why soda goes flat faster when warm. Pressure also plays a vital role: higher pressure forces more gas molecules into the liquid, a principle used in the carbonation of beverages.

Frequently Asked Questions

Does the Henry's Law constant change?

Yes, the constant is highly dependent on temperature. The presets provided in this calculator are generally based on standard room temperature (25°C). If your solution is significantly hotter or colder, the constant will vary.

What units should I use for pressure?

While this calculator defaults to Atmospheres (atm), you can use other units as long as your Henry's Constant matches those units. For standard chemical applications, atm and mol/L are the most common benchmarks.