Answer
Please see the work below.
Work Step by Step
We know that the metal ions for example $Pb^{+2}$ and $Zn^{+2}$are separated by controlling $[S^{-2}]$ in solution of $H_2S$ by adjusting PH.
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 17 - Solubility and Complex-Ion Equilibria - Questions and Problems - Page 733: 17.6
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