Answer
$NH_{4}^{+}$ and $Cl^{-}$
Work Step by Step
When you mix ammonium and chloride, they are soluble with one another so no precipitate forms. Calcium and phosphate will form a precipitate when reacted with one another.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 4 - Reactions in Aqueous Solution - Exercises - Page 158: 4.25c
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