In Chapter 12, you learned that when metal ions dissolve in water they become solvated (hydrated), meaning they form ion–dipole attractions to many water molecules (often six). For example, Na⁺(aq) really looks like this in water:

Fe³⁺ (aq) ions also do this, but unlike Na⁺(aq) ions, they also make the solution acidic. The reason is that one of the bound water molecules can donate a proton to a free water molecule in the solvent. Draw a picture like the one above for Fe³⁺ (aq), and show how Fe³⁺ (aq) makes water acidic.

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Nat