The two half-reactions below are to be combined into a single overall reaction

CHEMISTRY · Subjective · A Level · Chemistry · Oxidation, reduction and redox reactions · Oxidation, reduction and redox reactions

Problem

The two half-reactions below are to be combined into a single overall reaction. (i) Cu → Cu^{2+} + 2e^{−} (ii) Ag^{+} + e^{−} → Ag In one concise sentence, explain why the silver half-reaction must be multiplied by 2 before the half-reactions are added together.

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