# Ionic Strength Formula

The amount of the ion concentration in the solution is the ionic strength of the solution. It is articulated as I. The ion activity is affected by it. It is denoted with the ion interaction with water and other ions in the solution. To compute the half of the total concentration of each ionic species, the ionic strength formula is used.
Ionic strength formula is articulated as

Where the molar concentration of an ion in a solution is Ci and Zi is the valence.

Ionic Strength Examples

Let’s explore some examples of ionic strength numerical:

Solved Samples

Problem 1: Calculate the ionic strength of KCl if its concentration is 2 M.

Answer:

Given:

 Ions Z C Z2 K+ 1 2 1 Cl– 1 2 1

The ionic strength is given by
I = $\frac{1}{2}$ [(2 $\times$ 1) + (2 $\times$ 1)]

= 2

Problem 2: Calculate the ionic strength of K2SO4.

Answer:

Given

 Ions Z C Z2 K+ 1 2 1 SO4-2 2 1 4

The ionic strength is given by
I = $\frac{1}{2}$ [(2 $\times$ 1) + (1 $\times$ 4)]
= 3

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