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Electrochemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryElectrochemistry2 Marks
Question
Using the standard electrode potentials given in Table $3.1,$ predict if the reaction between the following is feasible:
$Fe^{3+}\ (aq)$ 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 $E^\circ$ for the overall reaction is positive, the reaction between $Fe^{3+}$ (aq) and $I^-\  (aq)$ is feasible.

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