Answer
Please see the work below.
Work Step by Step
We know that a reaction where $PO_4^{-2}$ acts as an acid is $HPO_4^{-2}+OH^- \rightarrow\leftarrow PO_4^{-3}+H_2O$
A reaction where $HPO_4^{-2}+H_3O^+\rightarrow \leftarrow H_2PO_4^{-}+H_2O$
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 15 - Acids and Bases - Exercises - Page 657: 15.22
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