Which ionic equation represents a spontaneous reaction that can occur in a voltaic cell? 1. cu(s) + zn(s) → cu2+(aq) + zn2+(aq) 2. cu(s) + zn2+(aq) → cu2+(aq) + zn(s) 3. cu2+(aq) + zn(s) → cu(s) + zn2+(aq) 4. cu2+(aq) + zn2+(aq) → cu(s) + zn(s)

3. Cu²⁺₍aq₎ + Zn₍s₎ → Cu₍s₎ + Zn²⁺

Explanation:

In a voltaic cell where copper (II) suphate is the electrolyte and zinc and copper electrodes copper is deposited while zinc goes into solution.  

Zn₍s₎ → Zn ²⁺ ₍aq₎ +2e⁻

The two electrons are taken by copper ions to form copper atoms.

Cu²⁺₍aq₎ + 2e⁻ → Cu₍s₎

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