Cell Notation & Equations
Electrode Potentials Worksheet
You need to use the Electrochemical Series Data to answer these questions.
1. Writing Cell Notation
Cells are formed from the following half-cells. Write the notation for the cells.
a) Zn²⁺ / Zn and Cu²⁺ / Cu
Zn(s) | Zn²⁺(aq) || Cu²⁺(aq) | Cu(s)
b) Cr²⁺ / Cr and Li⁺ / Li
Li(s) | Li⁺(aq) || Cr²⁺(aq) | Cr(s)
c) H⁺ / H₂ and Fe²⁺ / Fe
Pt(s) | H₂(g) | H⁺(aq) || Fe²⁺(aq) | Fe(s)
(Hydrogen electrode on the left as it is a standard)
d) Fe³⁺ / Fe²⁺ and I₂ / I⁻
Pt(s) | I⁻(aq), I₂(aq) || Fe³⁺(aq), Fe²⁺(aq) | Pt(s)
e) MnO₄⁻ / Mn²⁺ and Cr₂O₇²⁻ / Cr³⁺
Pt(s) | Cr³⁺(aq), Cr₂O₇²⁻(aq), H⁺(aq) || MnO₄⁻(aq), Mn²⁺(aq), H⁺(aq) | Pt(s)
f) Ag⁺ / Ag and S₄O₆²⁻ / S₂O₃²⁻
Ag(s) | Ag⁺(aq) || S₂O₃²⁻(aq), S₄O₆²⁻(aq) | Pt(s)
(Silver electrode on the left as it is a standard)
2. Interpreting Cell Diagrams
The following cells are set up. Write the notation for the cells.
a) 
Pt(s) | Mn²⁺(aq), Mn³⁺(aq) || Cu⁺(aq) | Cu(s)
b) 
Zn(s) | Zn²⁺(aq) || Cr₂O₇²⁻(aq), H⁺(aq), Cr³⁺(aq) | Pt(s)
c) 
Ag(s) | Ag⁺(aq) || Pb⁴⁺(aq), Pb²⁺(aq) | Pt(s)
3. Equations from Notation
Given the following notations, write the equations.
a) Pb | Pb²⁺ || Cu²⁺ | Cu
Pb + Cu²⁺
→
Pb²⁺ + Cu
b) Na | Na⁺ || H₂O | O₂ || OH⁻
4Na + O₂ + 2H₂O
→
4Na⁺ + 4OH⁻
c) Cr²⁺ | Cr³⁺ || Cr₂O₇²⁻ | Cr³⁺
Cr₂O₇²⁻ + 14H⁺ + 6Cr²⁺
→
8Cr³⁺ + 7H₂O