Debye-Hückel Theory

The Debye-Hückel theory is a mathematical model that describes the interactions between ions in solution.

The assumptions of the Debye-Hückel theory are that the ions are point charges, that the solvent is a dielectric, and that the solution is dilute.

The mean ionic activity coefficient is a measure of the deviation from ideality in electrolyte solutions. It is a dimensionless quantity that is always less than or equal to 1.

The mean ionic activity coefficient can be calculated using the Debye-Hückel theory by solving the linearized Poisson-Boltzmann equation.