Electrochemistry Practice Test

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For the reaction Al(s) + Ni2+(aq) → Ni(s) + Al3+(aq), which species represents the oxidation half-reaction?

Ni2+(aq) ⟶ Ni(s)

Al(s) ⟶ Al3+(aq)

Oxidation is the loss of electrons. In this reaction, aluminum metal loses electrons to form Al3+(aq), so the oxidation half-reaction is Al(s) → Al3+(aq) + 3 e-. The oxidation state of aluminum rises from 0 to +3, signaling oxidation. The species that gains electrons is nickel(II) ion, which is reduced: Ni2+(aq) + 2 e- → Ni(s). If you tried to describe oxidation of nickel metal or reduction of aluminum ions, those would not match the actual electron flow in this equation.

Ni(s) ⟶ Ni2+(aq)

Al3+(aq) ⟶ Al(s)

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