Write the equations describing the electrode reactions and the net cell reaction for the following electrochemical cells:

Pt(s) | H₂(g) | H⁺(aq) || Cd²⁺(aq) | Cd(s)

Pb(s) | PbSO₄(s) | K₂SO₄(aq) | Hg₂SO₄(s) | Hg(l)

Question

Write the equations describing the electrode reactions and the net cell reaction for the following electrochemical cells:

Pt(s) | H₂(g) | H⁺(aq) || Cd²⁺(aq) | Cd(s)

Pb(s) | PbSO₄(s) | K₂SO₄(aq) | Hg₂SO₄(s) | Hg(l)

| General Chemistry 3

Accepted Answer

Pt(s) | H₂(g) | H⁺(aq) || Cd²⁺(aq) | Cd(s):

H₂ (g) → 2 H⁺ (aq) + 2 e^-

Cd²⁺ (aq) + 2 e^- → Cd (s)

Net cell reaction: H₂ (g) + Cd²⁺ (aq) → 2 H⁺ (aq) + Cd (s)

Pb(s) | PbSO₄(s) | K₂SO₄(aq) | Hg₂SO₄(s) | Hg(l):

Pb (s) + SO₄^2- (aq) → PbSO₄ (s) + 2 e^-

Hg₂SO₄ (s) + 2 e^- → Hg (l) + SO₄^2- (aq)

Net cell reaction: Pb (s) + Hg₂SO₄ (s) → PbSO₄ (s) + 2 Hg (l)

Exercise 1 | Electrochemistry