Question
Using Nernst equation, calculate the potentials for the following half reactions :
(a) $I _{2( s )}+2 e ^{-} \longrightarrow 2 I ^{-},\left[ I ^{-}\right]=0.03 M$,
$E_{ I ^{-} / I _2}^0= 0 . 5 3 5 V .$
(b) $Fe _{\text {(aq) }}^{3+}+ e ^{-} \longrightarrow Fe _{(\text {aq }}^{2+},\left[ Fe ^{2+}\right]=0.1 M$, $\left[ Fe ^{3+}\right]=0.01 M \quad E ^0 Fe ^{3+}, Fe ^{2+}=0.771 V$.
(a) $I _{2( s )}+2 e ^{-} \longrightarrow 2 I ^{-},\left[ I ^{-}\right]=0.03 M$,
$E_{ I ^{-} / I _2}^0= 0 . 5 3 5 V .$
(b) $Fe _{\text {(aq) }}^{3+}+ e ^{-} \longrightarrow Fe _{(\text {aq }}^{2+},\left[ Fe ^{2+}\right]=0.1 M$, $\left[ Fe ^{3+}\right]=0.01 M \quad E ^0 Fe ^{3+}, Fe ^{2+}=0.771 V$.