Chemistry

Ionic Strength Calculator

Find the ionic strength of a solution (two ions).

Calculated Output

Ionic strength (mol/L) 0.1

Formula: I = ½ Σ cᵢ · zᵢ²

Step-by-Step Breakdown

1. Values used:

2. Ion 1 concentration = 0.1 mol/L

3. Ion 1 charge = 1

4. Ion 2 concentration = 0.1 mol/L

5. Ion 2 charge = -1

7. Ionic strength = Ion 1 concentration x Ion 1 charge = 0.1 x 1 = 0.1mol/L

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The math behind it

I = ½ × Σ (concentration × charge²) over all ions.

0.1 M NaCl → I = 0.1 mol/L.

Why charge²?

Higher charges have a much stronger effect on solution non-ideality.