Considering 0.10 M solutions of each substance,which contains the smallest concentration of ions? A)(NH₄)₃PO₄ B)Ca(NO₃)₂ C)FeSO₄ D)K₂CO₃ E)Na₂SO₄

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The substance with the smallest concentration of ions will be the one that dissociates the least in solution, meaning it has the lowest ionization or dissociation constant. 
Out of the given options, FeSO4 has the lowest solubility product constant (Ksp), indicating that it dissociates the least and therefore has the smallest concentration of ions in solution compared to the other options.