Chapter 19, Problem 53A

Interpretation Introduction

Interpretation:

It is necessary to know the medium of solution before balancing the redox reaction. Explain.

Concept introduction:

Some redox reactions take place in acidic or basic medium. Before balancing the equation one must know the medium in which reaction is taking place.

Answer to Problem 53A

A reaction is balanced if total number of atoms and net charge on both sides are equal. Acidic medium involves addition of $H^{+}$ and basic medium involves addition of $O{H}^{-}$ which are charged species. Thus to balance the reaction, it is important to know about the medium.

Explanation of Solution

Before balancing the redox equation one must know the medium in which reaction is taking place. Addition of $H^{+}$ increase the positive charge on left side and addition of $O{H}^{-}$ increases the negative charge on left side which need to be balance.

Conclusion

A reaction is balanced if total number of atoms and net charge on both sides are equal. Acidic medium involves addition of $H^{+}$ and basic medium involves addition of $O{H}^{-}$ which are charged species. Thus to balance the reaction, it is important to know about the medium.