Chemistry: The Molecular Science (5th Edition)

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

Chapter 14 - Acids and Bases - Questions for Review and Thought - General Questions - Page 652e: 92f


$H_2P{O_4}^-$ is an amphiprotic substance.

Work Step by Step

- $H_2{PO_4}^-$ is capable of donating a proton, and becoming $HP{O_4}^{2-}$ or receiving a proton, becoming $H_3PO_4$. Therefore it is considered amphiprotic. - You can also analyze the table $14.2$ (Page 624), and notice that $H_2P{O_4}^-$ has a $K_a$ value $(6.3 \times 10^{-8})$ and a $K_b$ value $(1.4 \times 10^{-12})$. Since both values are $> 10^{-14}$, we consider $H_2{PO_4}^-$ an amphiprotic substance.
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