Chapter 16, Problem 65E

BALANCING REDOX REACTIONS

Use the half-reaction method to balance each redox reaction occurring in acidic aqueous solution.

$\begin{array}{l}(a){\text{Cr}}_2{\text{O}}_{\text{7}}^{\text{2}-}\left(aq\right)+{\text{Fe}}^{2+}\left(aq\right)\to {\text{Cr}}^{3+}\left(aq\right)+{\text{Fe}}^{3+}\left(aq\right)\hfill \\ \left(b\right){\text{VO}}^{\text{2+}}\left(aq\right)+{\text{I}}^{-}\left(aq\right)\to {\text{V}}^{\text{3}}\left(aq\right)+{\text{I}}_2\left(aq\right)\hfill \\ \left(c\right){\text{NO}}_{3-}\left(aq\right)+\text{Co}\left(s\right)\to {\text{Co}}^{2+}\left(aq\right)+{\text{NO}}_2\left(g\right)\hfill \end{array}$