Question

At a particular temperature, for the same partial pressures, the value of $K_H$ (Henry’s constant) in water for $O_2$ is smaller than that of $N_2$. Which of the following is correct?

• A. $N_2$ is more soluble in water
• B. $O_2$ is more soluble in water
• C. Solubility is independent of $K_H$
• D. Both are equally soluble

Answer 1

The correct option is B $O_2$ is more soluble in water

According to Henry's law that the amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid.
$P=K_{H}C$
P = Partial pressure, $K_H$ = Henry's constant and C = concentration of dissolved gas.
Since partial pressure is equal for both the gases, value of $K_H$ is small for $O_2$ because it is more soluble in water than $N_2$