CHEMISTRY · Single correct · A Level · Chemistry · Electrode potentials · Electrode potentials
Problem
In the cell described above, nitrate ions are observed to migrate toward the zinc electrode. Which of the following best explains why this migration is necessary for continuous cell operation?
(a) It supplies additional oxidizing agent to the anode compartment.
(b) Its movement completes the external circuit, allowing electrons to flow through the wire.
(c) It prevents the buildup of excess positive charge produced by Zn2+ ions entering solution.
(d) It balances the charge by reacting with Zn2+ ions to form an insoluble precipitate, removing them from solution.