Henry's Law (Gas in Liquid)

$$p = K_H \cdot x$$

Concept: States that the partial pressure of a gas in the vapour phase is directly proportional to the mole fraction of the gas dissolved in the liquid medium.

Notation:

• $$p$$ = Partial pressure of the gas;
• $$K_H$$ = Henry's law constant;
• $$x$$ = Mole fraction of the gas in the liquid phase.

Alternate form

$$m = K'_H \cdot p$$

Concept: Relates the total mass of a gas dissolved per unit volume of a solvent directly to the partial pressure of that gas under equilibrium conditions.

Notation:

• $$m$$ = Mass of the dissolved gas;
• $$K'_H$$ = Alternative Henry's law constant.