everyday-household-items-such-as-flashlights-and-radios-use-alkaline-batteries-t

Question

Everyday household items such as flashlights and radios use alkaline batteries. The overall reaction in the battery is as follows: Zn(s) + 2 MnO₂(s) ⇌ ZnO(s) + Mn₂O₃(s). Using a reliable source, give the two half-reactions that occur in the battery and calculate the standard emf generated by the voltaic cell.

Accepted Answer

Anode: Zn(s) + 2 OH^–(aq) → ZnO(s) + H₂O(l) + 2 e^–
Cathode: 2 MnO₂(s) + H₂O(l) + 2 e^– ⟶ Mn₂O₃(s) + 2 OH^–(aq)
E°_cell = 1.43 V

Answer

Anode: Zn(s) + 2 OH^–(aq) → ZnO(s) + H₂O(l) + 2 e^–
Cathode: 2 MnO₂(s) + H₂O(l) + 2 e^– ⟶ Mn₂O₃(s) + 2 OH^–(aq)
E°_cell = –1.43 V

Answer

Anode: Mn₂O₃(s) + 2 OH^–(aq) ⟶ 2 MnO₂(s) + H₂O(l) + 2 e^–
Cathode: ZnO(s) + H₂O(l) + 2 e^– → Zn(s) + 2 OH^–(aq)
E°_cell = 1.13 V

Answer

Anode: Mn₂O₃(s) + 2 OH^–(aq) ⟶ 2 MnO₂(s) + H₂O(l) + 2 e^–
Cathode: ZnO(s) + H₂O(l) + 2 e^– → Zn(s) + 2 OH^–(aq)
E°_cell = –1.13 V

My Courses

Chemistry

Biology

Math

Physics

Business

Social Sciences

Programming

Product & Marketing