(i) What do you observe at the cathode and anode respectively. (ii) Name the cation that remains as a spectator ion in the solution. (iii) Which equation for the reaction at the anode is correct. 1. Ni ⟶ Ni2+ + 2e– 2. Ni + 2e– ⟶ Ni2+ 3. Ni2+ ⟶ Ni + 2e– 4. Ni2+ + 2e– ⟶ Ni(i) The observations at cathode and anode are:
At cathode: Ni2+ ions move towards cathode and are discharged as neutral Ni atoms by gain of electrons. Thus, Ni is deposited at cathode.
At anode: Diminishes in mass. Ni2+ ions are formed.
(ii) H+ ions.
(iii) Ni ⟶ Ni2+ + 2e–