The formula for magnesium chloride is MgCl₂, and in a solution the following process takes place:
MgCl₂ → Mg⁺² + 2Cl⁻
By analyzing the stoichiometric coefficients, we can tell that <em>the concentration of Mg⁺² ions is the same as the concentration of MgCl₂</em>, while the <em>Cl⁻ concentration is twice that value</em>.