Question

2-6.

(i) Considering the effects of the ionic strength, use Excel to calculate the cell voltage of Zn | ZnSO₄ (x M) || PbSO₄(s) | Pb, where x: 1´10^-4, 5´10^-4, 1´10^-3, 5´10^-3, 0.01, and 0.05 M.

PbSO₄ → Pb²⁺ + SO₄²⁺, K_sp = 1.69 ´ 10^-8

Pb²⁺ + 2e^- → Pb, E^o = -0.13 V vs. NHE

Zn²⁺ + 2e^- → Zn, E^o = -0.76 V vs. NHE

(ii) Recalculate the cell voltage when 1.0 M KNO₃ is present in the anodic half-cell.

(iii) Plot the results of (i) and (ii) against log(x) together on one sheet.

(iv) Give conclusions on the difference between the curves.

Thank you.

Answer 1