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Factors Affecting Conductance

The standard ...

Question

The standard electrode potentials(reduction) of Fe+3,Fe+2/Pt and Sn+4,Sn+2/Pt are + 0.77V and 0.15V respectively at 25oC. The standard EMF of the reaction Sn+4 +2Fe+2 --- Sn+2 + 2Fe+3 is what?

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Solution

Reaction is given as
Sn⁴⁺ + 2Fe²⁺ → Sn²⁺ + 2Fe³⁺
In this reaction reduction of tin and oxidation of iron occurs.
E_cell = E_{Sn⁺⁴,Sn⁺²}- E _{Fe⁺³,Fe⁺²}
E_cell = 0.15 - 0.77
= -0.62 V
As E_cell is negative so the reaction can not be possible.

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Similar questions

F e^{3 +}

F e^{2 +} / P t

S n^{4 +}

S n^{2 +} / P t

+ 0.77 V

0.15 V

25^{o} C

S n^{4 +} + 2 F e^{2 +} \to S n^{2 +} + 2 F e^{3 +}

Consider the following $E^{0}$ values:

$E_{F e^{3 +} / F e^{2 +}}^{0} = + 0.77 V$ ; $E_{S n^{2 +} / S n}^{0} = - 0.14 V$

Under standard conditions the EMF for the reaction

$S n_{(s)} + 2 F e {^{3 +}}_{(a q)} \to 2 F e {^{2 +}}_{(a q)} + S n {^{2 +}}_{(a q)}$ is :

E_{F e^{3 +} / F e^{2 +}}^{\circ} = + 0.77 V; E_{S n^{2 +} / S n}^{\circ} = - 0.14 V

S n_{(s)} + 2 F e_{(a q)}^{3 +} \to 2 F e_{(a q)}^{2 +} + S n_{(a q)}^{2 +}

E^{0}

E_{F e^{3 +} / F e^{2 +}}^{0}

E_{S n^{2 +} / S n}^{0}

S n (s) + 2 F e^{3 +} (a q) \to 2 F e^{2 +} (a q) + S n^{2 +} (a q)

298 K

2 F e^{3 +} + S n^{2 +} \to 2 F e^{2 +} + S n^{4 +}

E_{S n^{4 +} / S n^{2 +}}^{\circ} = 0.15 v o l t; E_{F e^{3 +} / F e^{2 +}}^{\circ} = 0.771 v o l t

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