17.1 Exercise 3

Assuming each pair of half-reactions below takes place in an acidic solution, write a balanced equation for the overall reaction.

(a) $\text{Ca} \rightarrow \text{Ca}^{2+} + \text{2e}^{−} ,$ $\text{F}_{2} + \text{2e}^{−} \rightarrow \text{2F}^{−}$

(b) $\text{Li} \rightarrow \text{Li}^{+} + \text{e}^{−} ,$ $\text{Cl}_{2} + \text{2e}^{−} \rightarrow \text{2Cl}^{−}$

(c) $\text{Fe} \rightarrow \text{Fe}^{3+} + \text{3e}^{−} ,$ $\text{Br}_{2} + \text{2e}^{-} \rightarrow \text{2Br}^{-}$

(d) $\text{Ag} \rightarrow \text{Ag}^{+} + \text{e}^{−} ,$ $\text{MnO}_{4} ^{-} + \text{4H}^{+} + \text{3e}^{−} \rightarrow \text{MnO}_{2} + \text{2H}_{2} \text{O}$