Answer
$Magnesium$
Work Step by Step
The metal in the activity series that reduced $Al^{3+}$ ions but not $Na^{+}$ ions is Magnesium because it's in between Aluminum and Sodium. It's lower than Na but higher than Al.
Introductory Chemistry (5th Edition)
by Tro, Nivaldo J.
Published by
Pearson
ISBN 10:
032191029X
ISBN 13:
978-0-32191-029-5
Chapter 16 - Oxidation and Reduction - Exercises - Problems - Page 605: 81
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