Henry's Law Calculator

Calculate Gas Solubility with Precision

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Gas Concentration Calculator

Calculate the concentration of dissolved gas using partial pressure and Henry's constant.

Concentration: - M

Partial Pressure Calculator

Calculate the partial pressure needed for a desired gas concentration.

Partial Pressure: - atm

Understanding Henry's Law

What is Henry's Law?

Henry's Law states that at a constant temperature, the amount of dissolved gas in a liquid is directly proportional to its partial pressure in the gas phase above the liquid.

C = k × P

Where:

  • C = Concentration of dissolved gas
  • k = Henry's law constant
  • P = Partial pressure of the gas

Temperature Effects

Henry's constant varies with temperature according to the van 't Hoff equation:

  • Solubility decreases with increasing temperature
  • The relationship is approximately exponential
  • Each gas has a unique temperature dependence

Applications

Henry's Law is crucial in many fields:

  • Carbonated beverages industry
  • Blood gas analysis in medicine
  • Environmental science and water treatment
  • Industrial gas separation processes
  • Deep-sea diving safety calculations

Limitations and Deviations

Henry's Law has several limitations:

  • Only valid for dilute solutions
  • Assumes ideal behavior of gases
  • Breaks down at high pressures
  • Not applicable when chemical reactions occur

Essential Henry's Law Formulas

Basic Henry's Law

C = kH × P

Temperature Dependence

kH(T) = kH°exp[-ΔH/R(1/T - 1/T°)]

Mole Fraction Form

x = P/kH