Question
Using the standard electrode potentials given in Table 3.1, predict if the reaction between the following is feasible:
Fe3+(aq) and I– (aq)
Fe3+(aq) and I– (aq)
✓
Answer
$\text{Fe}^{3+}_\text{(aq)}+\text{e}^-\rightarrow\text{Fe}^{2+}_\text{(aq)}\Big]\times2;\ \ \ \ \ \ \ \ \ \ \ \text{E}^\circ=+0.77\ \text{V}\\2\text{I}^-_\text{(aq)}\rightarrow2\text{I}_{2\text{(S)}}+2\text{e}^-;\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{E}^\circ=-0.54\ \text{V}\\\overline{2\text{Fe}^{3+}_\text{(aq)}+2\text{I}^-\rightarrow2\text{Fe}^{2+}_\text{(aq)}+\text{I}_{2\text{(s)}}\ \ \ \ \text{E}^\circ=+0.23\ \text{V}}$
Since E° for the overall reaction is positive, the reaction between Fe3+ (aq) and I- (aq) is feasible.
Since E° for the overall reaction is positive, the reaction between Fe3+ (aq) and I- (aq) is feasible.
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