Cell Potential: ∆G and K
20. Electrochemistry / Cell Potential: ∆G and K / Problem 4
Silver is extracted from its ore via the leaching process for the cyanide ion in that ore. Shown below is the overall reaction.
4 Ag (s) + 8 CN− (aq) + O2 (g) + 2 H2O (l) → 4 [Ag(CN)2]− (aq) + 4 OH− (aq)
Use the given data to calculate ΔG° for the above reaction at 25 °C.
Ag+ (aq) + 2 CN− (aq) → Ag(CN)2− (aq); Kf = 3.00×1020
H2O (l) ⇌ H+ (aq) + OH− (aq); Kw = 1.00×10−14
O2 (g) + 4 H+ (aq) + 4 e− → 2 H2O (l); E° = 1.229 V
Ag+ (aq) + e− → Ag (s); E° = 0.800 V
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