Ionic Strength Calculator

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

Ionic strength (mol/L) 0.1

Formula: I = ½ Σ cᵢ · zᵢ²

Step-by-step with your numbers:

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

Did we solve your problem today?

Ionic strength sums all ions weighted by the square of their charge.

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.