MediumChemistryHigh School (11–12)Redox Reactions › Oxidation Number and Types of Redox ReactionsNumericalA-Level AP IB NEET

For Zn²⁺(aq) + 2e⁻ → Zn(s), the standard electrode potential is -0.76 V…

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For $\text{Zn}^{2+}(aq) + 2e^- \rightarrow \text{Zn}(s)$ , the standard electrode potential is $-0.76\ \text{V}$ . What is $E^\circ$ for $2\text{Zn}^{2+}(aq) + 4e^- \rightarrow 2\text{Zn}(s)$ ? What is it for $\text{Zn}(s) \rightarrow \text{Zn}^{2+}(aq) + 2e^-$ ?

Need a reminder? The key ideaShow

$E^\circ$ is a reduction potential, measured against the standard hydrogen electrode, which is $0.00\ \text{V}$ , at $1\ \text{mol/L}$ , $1\ \text{bar}$ and $298\ \text{K}$ . $E^\circ_{cell} = E^\circ_{cathode} - E^\circ_{anode}$ . Reversing a half-reaction changes the sign of $E^\circ$ . Multiplying it changes nothing.

The worked solution

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