Answered: the standard reduction potentials…

the standard reduction potentials provided below, determine whether an acidic aqueous solution of Cr2+ ions liberates H2 from solution (assume standard conditions).

Introductory Chemistry: A Foundation

8th Edition

ISBN:9781285199030

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter13: Gases

Section: Chapter Questions

Problem 137AP

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Concept explainers

Electrolysis

Electrolysis is defined as the process of breaking down ionic compounds into their constituent elements by passing a direct electric current through the compound in a fluid state. The cathode reduces cations, while the anode oxidizes anions. An electrolyte, electrodes, and some form of external power source are the main components required for conducting electrolysis. A partition, such as an ion-exchange membrane or a salt bridge, may also be used, but this is optional. These are primarily used to prevent the products from diffusing near the opposing electrode.

Question

Given the standard reduction potentials provided below, determine whether an acidic aqueous
solution of Cr2+ ions liberates H2 from solution (assume standard conditions). Please show your
work.

Cr³+ (aq) + e
2H(aq) + 2e → H2(g)
Cr²+ (aq)
E° = -0.41 V
E° = 0 V

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