Question

Value of Henry's constant ${\mathrm{K}}_{\mathrm{H}}$?

• A. Increases with an increase in temperature
• B. Decreases with increase in temperature
• C. Remains constant
• D. First increases then decreases

Answer 1

The correct option is A

Increases with an increase in temperature

The explanation for the correct option

(a) increases with an increase in temperature

Henry's law

• According to Henry's law, a gas law, while the temperature is held constant, the amount of gas that is dissolved in a liquid is exactly proportional to the partial pressure of that gas above the liquid.
• The formula is as follows:

$\begin{array}{rcl}\mathrm{p}& \propto & \mathrm{x}\\ \mathrm{p}& =& {\mathrm{K}}_{\mathrm{H}}\mathrm{x}\\ {\mathrm{K}}_{\mathrm{H}}& =& \frac{\mathrm{p}}{\mathrm{x}}\end{array}$

• $\mathrm{p}$ is the partial pressure of a gas.
• $\mathrm{x}$ is the mole fraction.
• ${\mathrm{K}}_{\mathrm{H}}$ is the Henry's constant.

Henry's constant

• Only the nature of gas or liquid and temperature affect Henry's constant value.
• Therefore, the values of Henry's constant ${\mathrm{K}}_{\mathrm{H}}$ increase as the temperature increases and vice versa.

The explanation for incorrect options

• Henry's constant value increases with an increase in temperature.
• Hence all other options (B), (C) and (D) are incorrect.

Therefore, the correct option is (a) increases with an increase in temperature.