Answer
Please see the work below.
Work Step by Step
We will add just enough $Na_2SO_4$ to precipitate all $Ba^{+2}$ then filter off the $BaSO_4$ and add more $Na_2SO_4$ to precipitate all $Ca^{+2}$ ions.
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 735: 17.23
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