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Chapter 21: Q21.4P (page 972)

Water is used to balance O atoms in the half-reaction method. Why can鈥檛O2-ions be used instead?

Short Answer

Expert verified

Because water is an electrically neutral molecule, it is employed to balance oxygen atoms in the half-cell reaction method.

Step by step solution

01

What is the half-reaction method

We split the supplied reaction into two half-reactions using the half-reaction approach. To achieve the total response, we balance the two half-reactions separately and combine them.

02

Determining why can’t O2- ions be used instead 

Water is a positively charged ion, whereas O2-is an electrically neutral molecule.

The act of balancing a reaction entails balancing both the atoms and the charge. If a charged ion, such as O2-, is employed, only the atoms will be balanced, leaving the charge imbalanced.

As a result, in the half-cell reaction method, water is required to balance oxygen

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