In order for it to be applicable, the solvent must be without structure and the solution must be dilute.
This formula includes a constant that is taken to be one and a half moles per kilogram to the one-half power according to the Bates-Guggenheim convention. The Pitzer equations can apply it to higher ionic strengths and Lars Onsager modified it to account for Brownian motion. Its extended version contains a B coefficient that is multiplied by the square root of ionic strength and is generally determined empirically. In order for it to be applicable, the solvent must be without structure and the solution must be dilute. According to this formula, counter ions cause electric potential to be screened at a distance greater than a length named for one of its formulators. For 10 points, name this doubly eponymous equation used to calculate activity coefficients.
This formula includes a constant that is taken to be one and a half moles per kilogram to the one-half power according to the Bates-Guggenheim convention.
{Debye}-{Hückel} equation