Henry's Law Calculator
🧪 Solutions & Molarity. Use the Henry's law formula to find dissolved gas, henry's constant, gas pressure: pick the value you want, type the others, and the answer updates as you go.
CO₂ in water: k ≈ 0.034 mol/(L·atm).
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Dissolved gas | mol/L |
| Henry's constant | mol/(L·atm) |
| Gas pressure | atm |
Worked example
Find the dissolved gas when Henry's constant = 0.034 mol/(L·atm), Gas pressure = 1 atm.
Using C = k Pgas: Dissolved gas = 0.034 mol/L.
Frequently asked questions
What is the formula for Henry's law?
C = k Pgas. CO₂ in water: k ≈ 0.034 mol/(L·atm).
What do the letters stand for, and what units are used?
Dissolved gas in mol/L, Henry's constant in mol/(L·atm), Gas pressure in atm.
How do you calculate dissolved gas?
Put the values into C = k Pgas. For example, with Henry's constant = 0.034 mol/(L·atm), Gas pressure = 1 atm, dissolved gas = 0.034 mol/L.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (dissolved gas, henry's constant, gas pressure) and fill in the others: it rearranges the formula for you.
