Chapter 15, Problem 84CP

Interpretation Introduction

Interpretation: To balance the equation for the reaction that takes place in basic solution.

  ${\text{CN}}^{\text{-}}\left(\text{aq}\right){\text{ + IO}}_{\text{3}}{}^{\text{-}}\left(\text{aq}\right)\to {\text{CNO}}^{\text{-}}\left(\text{aq}\right){\text{ + I}}^{\text{-}}\left(\text{aq}\right)$

Concept introduction: Here are the rules to balance redox reactions in basic medium:

Determine the oxidation numbers of the elements and write the oxidation and reduction half equation.

Balance the atoms of elements other than O and H. Use H₂O to balance O, H+ to balance H, electrons to balance the charges. Equalize the number of electrons on both the half reactions and then add the half reactions.

Add OH- to neutralize the excess protons since this is a basic medium. Add OH- to both side of the equation to balance it.