Answer
After generating a substantial amount of electrical current, the amount of $Zn^{+2}$ ions in the Solution will increase. The amount of $Ni^{+2}$ ions in solution will decrease as they get deposited on the electrode.
Work Step by Step
After generating a substantial amount of electrical current, the amount of $Zn^{+2}$ ions in the Solution will increase. The amount of $Ni^{+2}$ ions in solution will decrease as they get deposited on the electrode.
