Chapter 20, Problem 46E

Use line notation to represent each electrochemical cell in Problem 40

40. Sketch a voltaic cell for each redox reaction. Label the anode and cathode and indicate the half-reaction that occurs at each electrode and the species present in each solution. Also indicate the direction of electron flow.

1. ${\text{Ni}}^{\text{2}+}\left(aq\right)+\text{ Mg}\left(s\right)\to \text{Ni}\left(s\right)+{\text{ Mg}}^{\text{2}+}\left(aq\right)$
2. ${\text{2 H}}^{+}\left(aq\right)+\text{ Fe}\left(s\right)\to {\text{H}}_{\text{2}}\left(g\right)+{\text{ Fe}}^{\text{2}+}\left(aq\right)$
3. ${\text{2 NO}}_{\text{3}}{}^{–}\left(aq\right)+{\text{ 8 H}}^{+}\left(aq\right)+\text{ 3 Cu}\left(s\right)\to \text{2 NO}\left(g\right)+{\text{ 4 H}}_{\text{2}}\text{O}\left(l\right)+{\text{ 3 Cu}}^{\text{2}+}\left(aq\right)$