Answer
Please see the work below.
Work Step by Step
We know that the solution of $Na_2SO_4$ is colorless which shows that $SO_4^-2$ is colorless and the blue color is because of $Cu^+2$.
Chemistry 12th Edition
by Chang, Raymond; Goldsby, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0078021510
ISBN 13:
978-0-07802-151-0
Chapter 8 - Periodic Relationships Among the Elements - Questions & Problems - Page 365: 8.119
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