   Chapter 21, Problem 32PS

Chapter
Section
Textbook Problem

(a) Write equations for the half-reactions that occur at the cathode and the anode when an aqueous solution of KCl is electrolyzed. Which chemical species is oxidized, and which chemical species is reduced in this reaction? (b) Predict the products formed when an aqueous solution of CsI is electrolyzed.

(a)

Interpretation Introduction

Interpretation: To write the half-cell reaction occurring at cathode and anode in the electrolysis of KCl.

Concept introduction: Electrolysis is a process of decomposition of salts of the compound by passing an electric current through the aqueous solution of salts. Generally, alkali metal halides such as NaCl, KCl and CsCl are used for the process of electrolysis. On passing electric current, The salt decomposes to give ions in solution. The ions are oxidized and reduced to their elemental form in the process of electrolysis.

Oxidation - Loss of electrons by a species and so oxidation number is increases.

Reduction – Gain of electrons by a species and so oxidaitoion number ois decreases.

Explanation

The two electrodes are cathode and anode. The reaction occurring at each electrode is known as half-cell reaction. The reduction process occurs at the cathode and the oxidation process occurs at the anode.

Potassium ions gain electrons to form potassium atom.

2K++2e2K

Chloride ion loses electrons to form chlorine atom

(b)

Interpretation Introduction

Interpretation: To predict the products formed on electrolysis of CsI.

Concept introduction: Electrolysis is a process of decomposition of salts of the compound by passing an electric current through the aqueous solution of salts. Generally, alkali metal halides such as NaCl, KCl and CsCl are used for the process of electrolysis. On passing electric current, The salt decomposes to give ions in solution. The ions are oxidized and reduced to their elemental form in the process of electrolysis.

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