1. The following oxidation and reduction half-reactions are possible for the electrolysis of potassium iodide solution. The solution contains water molecules, potassium ions (K*), and iodide ions (I-). 2H,O(1) O,(g) + 4H*(aq) + 4e- 2H,O(1) + 2e- → H,(g) + 20H(aq) K*(aq) + e- → K(s) 21-(aq) L(s) + 2e- a. What product was formed at the anode in the electrolysis of potassium iodide solution? Explain, citing specific evi- dence from your observations. b. What product was formed at the cathode in the electrolysis of potassium iodide solution? Explain based on your observations. c. Write the balanced chemical equation for the overall redox reaction in the electrolysis of aqueous potassium iodide. Hint: Remember to balance the electrons!

1. The following oxidation and reduction half-reactions are possible for the electrolysis of potassium iodide solution. The solution contains water molecules, potassium ions (K), and iodide ions (I-). 2H,O(1) O,(g) + 4H(aq) + 4e- 2H,O(1) + 2e- → H,(g) + 20H(aq) K*(aq) + e- → K(s) 21-(aq) L(s) + 2e- a. What product was formed at the anode in the electrolysis of potassium iodide solution? Explain, citing specific evi- dence from your observations. b. What product was formed at the cathode in the electrolysis of potassium iodide solution? Explain based on your observations. c. Write the balanced chemical equation for the overall redox reaction in the electrolysis of aqueous potassium iodide. Hint: Remember to balance the electrons!

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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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

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1. The following oxidation and reduction half-reactions are possible for the electrolysis of potassium iodide solution. The
solution contains water molecules, potassium ions (K*), and iodide ions (I-).
2H,O(1)·
0,(g) + 4H*(aq) + 4e-
2H,0(1) + 2e- →
H,(g) + 20H (aq)
K*(aq) + e- →
K(s)
21-(aq)
L(s) + 2e-
a. What product was formed at the anode in the electrolysis of potassium iodide solution? Explain, citing specific evi-
dence from your observations.
b. What product was formed at the cathode in the electrolysis of potassium iodide solution? Explain based on your
observations.
c. Write the balanced chemical equation for the overall redox reaction in the electrolysis of aqueous potassium iodide.
Hint: Remember to balance the electrons!

|Bubblinig Solatron Yhunel Dark soliol de pornted.
Data Table
Observations
Electrolyte
(Salt Solution)
Anode
Cathode
Yelloy subrtynce Jamed
Solidformed on eleprode
Sola hon termel flack oden shad isadled. pink
Bubbfing.
Solutio, humed
Potassium Iodide
Rpblig with oglor
Chlonne!. Tum fue
then Bubbling. Solutran Hemed
Sodium Chloride
KI and starch adoled.
pink.
Bubbling- Solatron Yeuanol Dayk soliol de posnted.
yellow! Stong odor.
Coloris neddish- browwn.
Copper(II) Bromide

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