Answer
$K_3PO_4$ is soluble.
Work Step by Step
Generally, compounds with the $PO{_4}^{3-}$ group are not soluble in water. But, $K_3PO_4$ is an exception, since $K^{+}$ is on the exceptions column* for that rule.
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 4 - Sections 4.1-4.9 - Exercises - Problems by Topic - Page 188: 74d
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