First slide

Standard EMF of a cell

Question

Consider the following E⁰ values
E⁰ Fe³⁺ / Fe²⁺ = + 0.77 V
E⁰Sn²⁺ / Sn = – 0.14 V
Under standard conditions the potential for the reaction
    $\large S{n_{\left( s \right)}}\, + \,2F{e^{3 + }}_{\left( {aq} \right)}\, \to \,2F{e^{2 + }}_{\left( {aq} \right)} + \,S{n^{2 + }}_{\left( {aq} \right)}$    is

Moderate

A

1.68 V
B

0.63 V
C

0.91 V
D

1.40 V

Solution

From the given cell reaction anode is Sn and cathode is Fe.
${E_{cell}} = E_c^o - E_a^o$
= 0.77 - (-0.14) = 0.91 V

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