Question

What is the significance of Henry’s Law constant $K_H$?

Answer 1

Henry's law states that "the partial pressure of the gas in the vapour phase (P) is proportional to the mole fraction (X) of the gas in the solution.”

Mathematically, at constant temperature:

$P=K_{H}X$

where $K_H$ is Henry's Law constant.

From the equation, we can deduce that:

$K_H=\frac{P}{X}$

The higher the value of $K_H$ at a given pressure, the lower is the solubility of the gas in the liquid.