Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 17 - Electrochemistry and Its Applications - Exercise 17.1 - The Nitrogen Cycle: A Review of Oxidation Numbers - Page 739: b



Work Step by Step

In a polyatomic ion, the sum of the oxidation numbers of all atoms is equal to the overall charge on the ion. The overall charge on $NO_{3}^{-}$ ion is -1. Let the oxidation number of nitrogen be $x$. The oxidation number of each oxygen atom is -2. Therefore, we can write $x+3(-2)=-1$ Or $x=+5$
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