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Hint: In this question you must make use of your knowledge of thermodynamics and the redox potential table. During the electrolysis of an aqueous KCI solution using inert electrodes, two of the following reactions take place at the electrodes, respectively. The pH of the solution around one or both of the electrodes changes as the reaction proceeds. (1) 2H,0(P) +2e-→H,(g) +2OH¯(aq) (2) H2(g) + 20H -(aq) → 2H,0(€) + 2e¯ (3) 0,(g) + 4H,0+ (aq) + 4e-→ 6H,0(e) (4) 6H,0(P) →0,(g) + 4H,0*(aq) + 4e- (5) 2CC=(aq) → Cl,(g) +2e¯ (6) Ce ,(g) + 2e-→ 2Ce-(aq) The cathode is the (type 'negative' or 'positive') electrode, at which (type 'reduction' or 'oxidation') takes place. As the reaction proceeds, the pH at this electrode (type 'increases' or decreases'). The reaction taking place at the anode is (choose from reactions (1) to (6) above - type your answer as a number within brackets, eg (3)). Electron flow between the external circuit and the anode is (type 'out of or 'into') the electrode.

Hint: In this question you must make use of your knowledge of thermodynamics and the redox potential table. During the electrolysis of an aqueous KCI solution using inert electrodes, two of the following reactions take place at the electrodes, respectively. The pH of the solution around one or both of the electrodes changes as the reaction proceeds. (1) 2H,0(P) +2e-→H,(g) +2OH¯(aq) (2) H2(g) + 20H -(aq) → 2H,0(€) + 2e¯ (3) 0,(g) + 4H,0+ (aq) + 4e-→ 6H,0(e) (4) 6H,0(P) →0,(g) + 4H,0*(aq) + 4e- (5) 2CC=(aq) → Cl,(g) +2e¯ (6) Ce ,(g) + 2e-→ 2Ce-(aq) The cathode is the (type 'negative' or 'positive') electrode, at which (type 'reduction' or 'oxidation') takes place. As the reaction proceeds, the pH at this electrode (type 'increases' or decreases'). The reaction taking place at the anode is (choose from reactions (1) to (6) above - type your answer as a number within brackets, eg (3)). Electron flow between the external circuit and the anode is (type 'out of or 'into') the electrode.

Principles of Modern Chemistry
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter17: Electrochemistry
Section: Chapter Questions
Problem 77AP
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Hint: In this question you must make use of your knowledge of thermodynamics and the redox potential table. During the electrolysis of an aqueous KCI solution using inert electrodes, two of the following reactions take place at the electrodes, respectively. The pH of the solution around one or both of the electrodes changes as the reaction proceeds. (1) 2H,0(P) + 2e-→H,(g) + 20H¯(aq) (2) H,(g) + 20H-(aq) → 2H,0(P) + 2e- (3) 0,(g) + 4H,0*(aq) + 4e¯→ 6H,0(8) (4) 6H,0(8) →O,(g) + 4H,0+(aq) + 4e- (5) 2C²¯ (aq) → Ce,(g)+2e¯ (6) Ce2(g) +2e¯→ 2Ce-(aq) The cathode is the (type 'negative' or 'positive') electrode, at which (type 'reduction' or 'oxidation') takes place. As the reaction proceeds, the pH at this electrode (type 'increases' or decreases'). The reaction taking place at the anode is (choose from reactions (1) to (6) above - type your answer as a number within brackets, eg (3)). Electron flow between the external circuit and the anode is (type 'out of or 'into') the electrode.
Transcribed Image Text:Hint: In this question you must make use of your knowledge of thermodynamics and the redox potential table. During the electrolysis of an aqueous KCI solution using inert electrodes, two of the following reactions take place at the electrodes, respectively. The pH of the solution around one or both of the electrodes changes as the reaction proceeds. (1) 2H,0(P) + 2e-→H,(g) + 20H¯(aq) (2) H,(g) + 20H-(aq) → 2H,0(P) + 2e- (3) 0,(g) + 4H,0*(aq) + 4e¯→ 6H,0(8) (4) 6H,0(8) →O,(g) + 4H,0+(aq) + 4e- (5) 2C²¯ (aq) → Ce,(g)+2e¯ (6) Ce2(g) +2e¯→ 2Ce-(aq) The cathode is the (type 'negative' or 'positive') electrode, at which (type 'reduction' or 'oxidation') takes place. As the reaction proceeds, the pH at this electrode (type 'increases' or decreases'). The reaction taking place at the anode is (choose from reactions (1) to (6) above - type your answer as a number within brackets, eg (3)). Electron flow between the external circuit and the anode is (type 'out of or 'into') the electrode.
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