Chapter 18, Problem 18.40QE

A voltaic cell is based on the reaction

$\text{Zn}\left(\text{s}\right)+{\text{Ni}}^{2+}\left(\text{aq}\right)\to {\text{Zn}}^{2+}\left(\text{aq}\right)+\text{Ni}\left(\text{s}\right)$

Voltage measurements show that the Ni electrode is positive. Sketch the cell, and label the anode and cathode, the positive and negative electrodes, the direction of electron flow in the external circuit, and the direction of flow of cations and anions through the salt bridge. Write the half-reaction that occurs at each electrode.