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Oxidize zinc at the anode and reduce nitrate to nitric oxide at the inert platinum cathode. Multiplying the oxidation half-reaction by three and the reduction half-reaction by two cancels six electrons:The standard cell potential is the cathode reduction potential minus the anode reduction potential:The written direction is spontaneous under standard conditions, since ${\Delta }_r{G}^{\circ }=-6F{E}^{\circ }<0$. Multiplying a half-reaction changes its extensive Gibbs energy, but does not multiply its intensive electrode potential.