Henry's Law Calculator
Calculate gas solubility: C = kH x P. Enter Henry's constant and partial pressure.
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Enter the Henry's law constant for the gas in the desired solvent (common values are for water at 25 C) and the partial pressure of the gas. The calculator multiplies them to give the dissolved concentration.
About the Henry's Law Calculator
Henry's law describes gas solubility in liquids as a function of pressure. Formulated by William Henry in 1803, it explains everyday phenomena like carbonation, decompression sickness in divers, and the oxygen-carrying capacity of blood. It applies to dilute solutions at moderate pressures.
Frequently Asked Questions
What is Henry's law?
Henry's law states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid: C = kH x P. It applies to dilute solutions at moderate pressures.
What is the Henry's law constant for CO2?
For CO2 in water at 25 C, kH is approximately 0.034 mol/(L atm). This means at 1 atm CO2 pressure, about 0.034 mol/L dissolves. Other gases: O2 = 0.0013, N2 = 0.00065 mol/(L atm).
Why do carbonated drinks fizz when opened?
The drink is sealed under high CO2 pressure, dissolving more CO2 than at atmospheric pressure (Henry's law). When opened, the pressure drops, the dissolved CO2 exceeds its new solubility limit, and it escapes as bubbles.