Question

According to which law the solubility of a gas at equilibrium and constant temperature varies directly with the pressure of the gas, provided the gas does not undergo any chemical change during the dissolution?

Options

• Raoult’s law

• Nernst distribution law

• Henry’s law

• van’t hoff law

Answer 1

Henry’s law

Explanation:

Henry’s law states that at constant temperature, the solubility of a gas in a liquid is directly proportional to the pressure of the gas above the liquid, provided the gas does not undergo any chemical change during dissolution.

C = k_H . P

Where:

C = Concentration (solubility) of the gas

P = Partial pressure of the gas

k_H​ = Henry’s law constant