“Two hypothetical divalent metals A and B have standard potentials of $-0.22\ \text{V}$ and $-0.31\ \text{V}$. A bath has $\text{A}^{2+}$ at $1.0 \times 10^{-5}\ \text{mol/L}$ and $\text{B}^{2+}$ at $0.90\ \text{mol/L}$. Which metal deposits first at $298\ \text{K}$?” is available to Standard subscribers.