Question

State and explain Henry’s law.

Answer 1

Henry’s law: 

This law states “that the partial pressure of the gas in vapour phase is directly proportional to the mole fraction (x) of the gaseous solute in the solution at low concentrations.”

P_solute ∝ x_{solute in solution} 

P_solute = K_H . x_{solute in soluation} 

x_solute = mole fraction of solute in the solution 

K_H = empirical constant. 

P_solute = Vapour pressure of the solute (or) the partial pressure of the gas in vapour state. The value of K_H depends on the nature of the gaseous solute and solvent.