Chapter 15, Problem 15.78CQ

Interpretation Introduction

Interpretation:

Use half-reactions to balance the following equations in the acidic solution:

  $\text{Mn}\left(\text{s}\right){\text{ + Cr}}^{\text{3+}}\left(\text{aq}\right)\to {\text{Mn}}^{\text{2+}}\left(\text{aq}\right)\text{ + Cr}\left(\text{s}\right)$

Concept introduction:Here are the steps to balance redox reaction sin an acidic medium:

1. Determine the oxidation numbers of the elements to figure out the oxidation and reduction half of the equation.
2. To balance every half reaction in acidic medium, use H₂O to balance O, use H+ to balance H, and finally use electrons to balance the net charge.