Electrolytes - 1 | Chemical Reactions and Properties of Solutions

Ionic strength I = $\frac{1}{2} \sum _{i = 1}^n c_{\mathit{i}}\mathit{ }{{\mathit{z}}_{\mathit{i}}}^{\mathit{2}}$

Na₂SO₄ → 2 Na⁺ + SO₄^2-

0.1 M of Na₂SO₄ = 0.2 M of Na⁺ and 0.1 M of SO₄^2-

I = $\frac{1}{2}$ x ( 0.2 x 1² + 0.1 x (-2)² ) = 0.3 M

MgSO₄ → Mg²⁺ + SO₄^2-

0.1 M of MgSO₄ = 0.1 M of Mg²⁺ and 0.1 M of SO₄^2-

I = $\frac{1}{2}$ x ( 0.1 x 2² + 0.1 x (-2)² ) = 0.4 M