Answer
$Pb^{+2}$
Work Step by Step
Lead (II) is the only cation that will form a precipitate with all three solutions based on the solubility rules and chart. Potassium and Barium both form soluble solutions.
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: 4.27
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