Question

Which of the following option(s) is/are correct with respect to Henry's law?
[Assuming solvent to be water]

• A. Value of $K_H$ (Henry's constant) increases with an increase in temperature
• B. Different gases have different $K_H$ (Henry’s law constant) value at the same temperature
• C. Henry's law is not applicable for $HCl\left(g\right)$
• D. $K_H$ is inversely proportional to pressure

Answer 1

Answer: (A), (B), (C)

Henry's law is not applicable for $HCl\left(g\right)$

According to Henry's law, the solubility of a gas in a liquid is directly proportional to the pressure of gas.
$P\propto X$
$P=K_{H}X$
$P\to$ Partial pressure of gas
$X\to$ Solubility of gas in liquid
$K_H\to$ Henry’s constant
(a) $K_H$ depends only on nature of gas, nature of liquid and temperature $\left(T\right)$.
As the temperature increases ${}^{\prime }{K}_H^{\prime }$ increases and $X$ decreases.

(b) Different gases have different $K_H$ value at same temperature as $K_H$ is a function of the nature of gas.

(c) $HCl\left(g\right)$ doesn’t follow henry’s law $HCl$ forms hydrogen bonding with water. Henry’s law is only applicable if the interaction between the two substances is the same as between themselves.