Question

The value of Henry’s constant $K_H$ is _____________.

• A. greater for gases with lower solubility.
  
• B. greater for gases with higher solubility.
  
• C. not related to the solubility of gases
• D. constant for all gases

Answer 1

The correct option is A greater for gases with lower solubility.


Henry's law states that the amount of gas dissolved in a liquid is proportional to its partial pressure above the liquid. The proportionality constant is called Henry’s constant $\left(K_H\right)$.

$P=K_{H}X$

where,

$P$= Partial pressure of gas

$X$= solubility of gas in liquid

$K_H$ = Henry’s constant

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

The higher the value of $K_H$ at a given pressure, the lower is the solubility of the gas in the liquid. The Henry’s constant $K_H$ is also a function of the nature of the gas.

Hence, option (B) is correct.