Question

According to Henry's law, the partial pressure of gas $\left(P_g^{\prime }\right)$ is directly proportional to mole fraction of gas in dissolved state, i.e., $P_{gas}^{\prime }=K_H.X_{gas}$ where, $K_H$ is $:$ Henry's constant. Which are correct?

• A. $K_H$ is characteristic constant for a given gas-solvent system
• B. Higher is the value of $K_H$, lower is solubility of gas for a given partial pressure of gas
• C. $K_H$ has temperature dependance
• D. $K_H$ increases with temperature

Answer 1

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

The correct options are
A Higher is the value of $K_H$, lower is solubility of gas for a given partial pressure of gas
B $K_H$ has temperature dependance
C $K_H$ increases with temperature
D $K_H$ is characteristic constant for a given gas-solvent system

The value of Henry's law constant depends on the gas-solvent system. It is different for different gas-solvent systems.

For a given partial pressure of the gas, as the value of $K_H$ increases, the value of the mole fraction decreases, and the solubility also decreases.

Hence, Higher is the value of $K_H$, lower is the solubility of gas for a given partial pressure of the gas.

The value of $K_H$ depends upon temperature. With the increase in the temperature, the value of $K_H$ increases.