MediumChemistryHigh School (11–12)Redox Reactions › Oxidation Number and Types of Redox ReactionsNumerical

These metals have the following standard potentials for Mⁿ⁺/M: magnesium -2.37 V, zinc -0.76 V…

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These metals have the following standard potentials for $\text{M}^{n+}/\text{M}$ : magnesium $-2.37\ \text{V}$ , zinc $-0.76\ \text{V}$ , iron $-0.44\ \text{V}$ , lead $-0.13\ \text{V}$ , copper $+0.34\ \text{V}$ and silver $+0.80\ \text{V}$ . Which of them release hydrogen from dilute hydrochloric acid? How many are there?

Need a reminder? The key ideaShow

A reaction can happen if $E^\circ = E^\circ(\text{reduced}) - E^\circ(\text{oxidised})$ is positive. A metal with $E^\circ < 0$ releases hydrogen from dilute acid. $\Delta G^\circ = -nFE^\circ$ , with $F = 96500\ \text{C/mol}$ .

The worked solution

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← Use E°(Ag⁺/Ag) = +0.80 V and E°(Cu²⁺/Cu) = +0.34 V…The Daniell cell has E° = 1.10 V for a reaction that moves 2 mol of electrons… →

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