begin mathsize 36px style I equals 1 half sum for i of c subscript i z subscript i squared space end style

I = Ionic Strength ; ci =  concentration of the ith ion ; zi = Charge of the ith ion


Ionic strength of a solution indicates the concentration of ionic charge in the solution. Activity coefficient of an ionic solution is related to the ionic strength of the solution by Debye-Huckel formula.

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