Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 4 - Reactions in Aqueous Solutions - Questions & Problems: 4.124

Answer

Please see the work below.

Work Step by Step

We know that Iron(II) compounds can be oxidized to Iron(III) compounds. The sample can be tested with a small amount of oxidizing agent like a $KMnO_4$ solution, which is a deep purple color. We also know that a loss of color will show the pressure of an oxidizable substance like Iron(II) salt.
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