Question

Write the Standard Cell Notation and Half Reactions of the following voltaic cell combinations.

1. Zinc Nitrate (0.20 M) and Copper Nitrate (0.30 M); Copper – Anode, Zinc – Cathode

2. Lead Sulfate (0.25 M) and Zinc Sulfate (0.50 M); Lead – Cathode, Zinc – Anode

3. Copper Sulfate (0.65 M) and Lead Sulfate (0.20 M); Copper – Anode, Zinc – Cathode

4. Silver Nitrate (0.15 M) and Lead Nitrate (0.40 M); Silver – Anode, Lead – Cathode

5. Aluminum Nitrate (0.35 M) and Silver Nitrate (0.50); Aluminum – Anode, Silver – Cathode

6. Copper Nitrate (0.45 M) and Silver Nitrate (0.25 M); Copper – Anode, Silver – Cathode

Answer 1

Standard Cell Notation : The cell notation is noted as anode and cathode (half-cells) are separated by two bars which represent a salt bridge, with the anode on the left and cathode on the right side of the bar.

left electrode (anode) ll right electrode (cathode)

1,

Cell Notation: Cu∣Cu²⁺(0.3 M) ∥ Zn²⁺(0.2 M)∣Zn

Half Reactions: Cu(s) -----> Cu²⁺(aq) + 2e^-

Zn²⁺(aq)+ 2e^- ----->Zn(s)

2,

Cell Notation:Zn∣Zn²⁺(0.5 M) ∥ Pb²⁺(0.25 M)∣Pb

Half Reactions:  Zn(s) ----->Zn²⁺(aq) + 2e^-

Pb²⁺(aq) + 2e^- ----->Pb(s)

3.

Cell Notation: Cu∣Cu²⁺(0.65 M) ∥ Pb²⁺(0.20 M)∣Pb

Half Reactions:  Cu(s) -----> Cu²⁺(aq) + 2e^-

Pb²⁺(aq) + 2e^- ----->Pb(s)

4.

Cell Notation: Ag∣Ag⁺(0.15 M) ∥ Pb²⁺(0.40 M)∣Pb

Half Reactions: 2Ag(s) ----->2Ag⁺(aq) + 2e^-

   Pb²⁺(aq) + 2e^- ----->Pb(s)

5.

Cell Notation: Al∣Al³⁺(0.35 M) ∥ Ag⁺(0.5 M)∣Ag

Half Reactions:  Al(s) ----->Al³⁺(aq) + 3e^-

3Ag⁺(aq)+ 3e^- ----->3Ag(s)

6.

Cell Notation: Cu∣ Cu²⁺(0.45 M) ∥ Ag⁺(0.25 M)∣Ag

Half Reactions:  Cu(s) -----> Cu²⁺(aq) + 2e^-

2Ag⁺(aq)+ 2e^- ----->2Ag(s)