Answer
$CdS$ has the higher solubility.
Work Step by Step
$K_{ps} : CdS = 8 \times 10^{-28}$
$K_{ps} : CuS = 6 \times 10^{-37}$
Because CdS has a higher Kps value, it is more soluble.
The Kps values are given in the book.
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 17 - Additional Aspects of Aqueous Equilibria - Additional Exercises - Page 772: 17.98a
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