1. (a) K₂Cr2O7 reacts with Fe(II) to produce Cr(III) and Fe(III) in acid medium. Write down the balanced equation and construct the cell. Calculate the standard potential and equilibrium constant for this reaction at 298 K? (Given standard reduction potentials, Eº for chromium system is 1.33 V and Eº for iron system is 0.77 V). (b) Also discuss the effect of pH on the change in potential for chromium system in acid medium.

1. (a) K₂Cr2O7 reacts with Fe(II) to produce Cr(III) and Fe(III) in acid medium. Write down the balanced equation and construct the cell. Calculate the standard potential and equilibrium constant for this reaction at 298 K? (Given standard reduction potentials, Eº for chromium system is 1.33 V and Eº for iron system is 0.77 V). (b) Also discuss the effect of pH on the change in potential for chromium system in acid medium.

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter17: Electrochemistry

Section: Chapter Questions

Problem 59QAP

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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

1. (a) K₂Cr2O7 reacts with Fe(II) to produce Cr(III) and Fe(III) in acid medium. Write down
the balanced equation and construct the cell. Calculate the standard potential and equilibrium
constant for this reaction at 298 K? (Given standard reduction potentials, Eº for chromium
system is 1.33 V and Eº for iron system is 0.77 V).
(b) Also discuss the effect of pH on the change in potential for chromium system in acid
medium.

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