Reaction equilibrium

E_o [V]

Reduction reaction

${\text{Cr}}_2{\text{O}}_7^{2-}\left(\text{aq}\right)+14{\text{H}}^{+}+6{\text{e}}^{-}\rightleftharpoons 2{\text{Cr}}^{3+}\left(\text{aq}\right)+7{\text{H}}_2\text{O}$

1.36

Oxidation reaction

$2{\text{NO}}_2+2{\text{H}}_2\text{O}\rightleftharpoons 2{\text{NO}}_3^{-}+4{\text{H}}^{+}+2{\text{e}}^{-}$

0.803

Our proposed reduction reaction

${\text{Cr}}_2{\text{O}}_7^{2-}\left(\text{aq}\right)+6{\text{NO}}_2+2{\text{H}}^{+}\left(\text{aq}\right)\rightleftharpoons 2{\text{Cr}}^{3+}\left(\text{aq}\right)+{\text{H}}_2\text{O}+6{\text{NO}}_3^{-}\left(\text{aq}\right)$

0.56