Activity Coefficient Calculator

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Calculates the activity coefficient of an ion in a solution using the Debye-Hückel equation or its extended versions.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Ionic Charge (z), Ionic Strength (I), Hydrated Ionic Radius (a), and Debye-Hückel Equation Type in the units shown.

Step 2

Read Activity Coefficient (γ) 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.

Sodium Ion (Dilute)

Ionic Charge (z): 1 unit charge; Ionic Strength (I): 0.01 mol/L; Hydrated Ionic Radius (a): 4 Å (Angstroms); Debye-Hückel Equation Type: Extended Debye-Hückel Equation

Activity Coefficient (γ): 0.9014611119

Calcium Ion (Dilute)

Ionic Charge (z): 2 unit charge; Ionic Strength (I): 0.01 mol/L; Hydrated Ionic Radius (a): 4.1 Å (Angstroms); Debye-Hückel Equation Type: Extended Debye-Hückel Equation

Activity Coefficient (γ): 0.6611679786

Chloride Ion (Moderate)

Ionic Charge (z): -1 unit charge; Ionic Strength (I): 0.1 mol/L; Hydrated Ionic Radius (a): 3 Å (Angstroms); Debye-Hückel Equation Type: Extended Debye-Hückel Equation

Activity Coefficient (γ): 0.7536606556

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