Chemistry: The Molecular Nature of Matter and Change 7th Edition

Published by McGraw-Hill Education
ISBN 10: 007351117X
ISBN 13: 978-0-07351-117-7

Chapter 21 - Problems: 21.83

Answer

See explanation below.

Work Step by Step

The reaction is: 3 Cd2+(aq) + 2 Cr(s) --> 3 Cd(s) + 2 Cr3+(aq) E cell = -0.40 V - (-0.74 V) = 0.34 V In order to reverse the reaction, 0.34 V is required ,with the cell in its standard state. A 1.5 V supplies more potential, and hence the cadmium metal oxidizes to Cd2+ and chromium plates out.
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