How to Calculate Henry's Law
What is Henry's Law?
Henry's Law states that at constant temperature, the concentration of a dissolved gas in a liquid is directly proportional to the partial pressure of that gas above the liquid. C = P / kH.
Step-by-Step Guide
- 1C = P / kH (where kH is Henry's law constant, units L·atm/mol)
- 2Or: P = kH × C
- 3Temperature-dependent: gases become less soluble at higher temperatures
- 4kH for O₂ ≈ 769 L·atm/mol · kH for CO₂ ≈ 29.4 L·atm/mol
Worked Examples
Input
CO₂ at 1 atm · kH=29.4 L·atm/mol
Result
C = 1/29.4 = 0.034 mol/L
Dissolved CO₂ in carbonated drinks
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