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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:
$Ag(s)$ and $Fe^{3+}\ (aq)$
✓

Answer

$\ \ \ \text{Ag}_\text{(s)}\ \ \ \ \ \ \ \ \ \xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ } \text{Ag}^{+}_\text{(aq)}+\text{e}^- \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ;\ \ \ \ \ \ \ \ \ \ \ \ \text{E}^\circ=+0.80\ \text{V}\\\text{Fe}^{3+}_\text{(aq)}+\text{e}^-\ \ \ \ \ \ \xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ } \text{Fe}^{2+}_{\text{(aq)}}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ;\ \ \ \ \ \ \ \ \ \ \ \text{E}^\circ=+0.77\ \text{V}\\\overline{\text{Ag}_\text{(s)}+\text{Fe}^{3+}_\text{(aq)}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ }\text{Ag}^{+}_\text{(aq)}+\text{Fe}^{2+}_\text{(aq)} \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ;\ \ \ \ \ \ \ \ \ \ \ \ \text{E}^\circ=-0.03\ \text{V}}$
Since $E^\circ\ E$ for the overall reaction is negative, the reaction between $Ag(s)$ and $Fe^{3+}\ (aq)$ is not feasible.

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