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22/01/2022 3:17 pm
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Using the standard electrode potentials given in, predict if the reaction between the following is feasible:
(i) Fe3+(aq) and I- (aq)
(ii) Ag+ (aq) and Cu(s)
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22/01/2022 3:21 pm
(i) Fe3+(aq) and I- (aq)
Fe3+(aq) + e- → Fe2+(aq) ] x 2; E° = + 0.77 V
2I- (aq) → I2(s) + 2e-(s) ; E° = -0.54 V
2Fe3+(aq) + 2I- (aq) → 2Fe2+(aq) + I2(s) ; E° = +0.23 V
Since E° for the overall reaction is positive, the reaction between Fe3+(aq) and I- (aq) is feasible.
(ii) Ag+ (aq) and Cu(s)
Ag+ (aq) + e- → Ag(s) ] x 2 ; E° = + 0.80 V
Cu(s) → Cu2+(aq) + 2e-(s) ; E° = -0.34 V
2Ag+ (aq) + Cu(s) → 2Ag(s) + Cu2+(aq) ; E° = -0.46 V
Since E° for the overall reaction is positive, the reaction between Ag+(aq) and Cu(s) is feasible.