Ionic Strength Calculator

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Calculates the ionic strength of a solution based on the concentrations and charges of the ions present.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Concentration of Ion 1 (M), Charge of Ion 1, Concentration of Ion 2 (M), Charge of Ion 2, Concentration of Ion 3 (M), and Charge of Ion 3 in the units shown.

Step 2

Read Ionic Strength (I) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

NaCl Solution

Concentration of Ion 1 (M): 0.1 M; Charge of Ion 1: 1; Concentration of Ion 2 (M): 0.1 M; Charge of Ion 2: -1; Concentration of Ion 3 (M): 0 M; Charge of Ion 3: 0

Ionic Strength (I): 0.1 M

MgCl2 Solution

Concentration of Ion 1 (M): 0.05 M; Charge of Ion 1: 2; Concentration of Ion 2 (M): 0.1 M; Charge of Ion 2: -1; Concentration of Ion 3 (M): 0 M; Charge of Ion 3: 0

Ionic Strength (I): 0.15 M

K2SO4 Solution

Concentration of Ion 1 (M): 0.1 M; Charge of Ion 1: 1; Concentration of Ion 2 (M): 0.05 M; Charge of Ion 2: -2; Concentration of Ion 3 (M): 0 M; Charge of Ion 3: 0

Ionic Strength (I): 0.15 M

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