Question 20.11: Calculating the Equilibrium Constant from Cell emf The stand...

General Chemistry

Calculating the Equilibrium Constant from Cell emf

The standard emf for the following voltaic cell is $1.10 \mathrm{~V}$ :

$\mathrm{Zn}(s)\left|\mathrm{Zn}^{2+}(a q) \| \mathrm{Cu}^{2+}(a q)\right| \mathrm{Cu}(s)$

Calculate the equilibrium constant $K_{c}$ for the reaction

$\mathrm{Zn}(s)+\mathrm{Cu}^{2+}(a q) \rightleftharpoons \mathrm{Zn}^{2+}(a q)+\mathrm{Cu}(s)$

PROBLEM STRATEGY

Substitute the standard emf into the equation relating this quantity to the thermodynamic equilibrium constant, $K$ . Solve for $K$ . Note that $K=K_{c}$ .

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