Question

According to Henry's law 'the partial pressure of the gas in vapour phase (p) is proportional to the mole fraction of the gas in solution. The correct statement about Henry's constant is:

• A. higher the value of $K_H$ at a given pressure, higher is the solubility of the gas
• B. higher the value of $K_H$ at a given pressure, lower is the solubility of the gas
• C. $K_H$ is not a function of nature of gas
• D. $K_H$ value for all gases is same at a given pressure

Answer 1

Answer: (B)

higher the value of $K_H$ at a given pressure, lower is the solubility of the gas

As per Henry's law

$p=K_{H}x$

$K_H=\frac{p}{x}$

Here $x$ is a mole fraction of the gas.

At a constant pressure, $K_H$ is inversely proportional to $x$, therefore, higher the $K_H$ lower the solubility.

option B is correct.