Chapter 19.1, Problem 1RC

Interpretation Introduction

Interpretation:

The coefficient of ${\text{NO}}_{\text{2}}$ when the given reaction is balanced has to be determined.

Concept introduction:

Procedure for balancing redox equations:

Step 1: Write the unbalanced equation for the reaction in ionic form.

Step 2: Separate the equation into two half-reactions.

Step 3: Balance each half-reactions for number and type of atoms and charges. For reactions in an acidic medium, add ${\text{H}}_{\text{2}}\text{O}$ to balance the O-atoms and H⁺ to balance the H atoms.

Step 4: Add the two half-reactions together and balance the final equation. The equation must be atomically and electrically balanced. In case of different number of electrons, need to multiply one or both half-reactions to equalize the number of electrons.

Step 5: Finally, the number and type of atoms; charges on both sides of the equation must be same and balanced.