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  • Using the standard electrode potentials given in Table:

3.17    Using the standard electrode potentials given in Table 3.1, predict if the reaction between the following is feasible:

             (i) Fe^{3+}_{aq}\ and\ I^{-}_{aq}

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The concept used here will be that a reaction is feasible only if E_{cell} ^{\circ} is positive.

Anode and cathode reactions will be as follows:- 

                                           Fe^{3+}\ +\ e^-\ =\ Fe^{2+}                                E^{\circ}\ = 0.77\ V

                                                             2I^{-}\ =\ I_2\ +\ 2e^-                      E^{\circ}\ = -0.54\ V

So                                  E_{cell} ^{\circ} = 0.77 - 0.54 = 0.23\ V

So this reaction is feasible.

Posted by

Devendra Khairwa

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