Key Question #20 1. Describe Key between a galvanic and an electrolytic cell. (A

Question

Key Question #20 1. Describe Key between a galvanic and an electrolytic cell. (A marks) two differences 2 Two half cells in a galvanic cell consist of one iron (Fee) electrode in a solution (II) sulphate (Feso40. and a silver (Agus) electrode in a silver nitrate solution (12 marks) a. Assume the cell is operating as a galvanic cell, state the overall and half-cell reactions Describe what will happen to the mass of the cathode while the cell is operating operating as an electrolytic cell b. Repeat part a), assuming that the cell is Page 30 of 34 Copyright 2008 Durham Continuing Education

Explanation / Answer

A galvanic cell operates without the external force, that is it is a spontaneous process.

On the other hand, an electrolytic cell operates with an external force, it is an non-spontaneous process.

a. For galvanic cell system,

Half-reactions,

Fe(s) --> Fe2+(aq) + 2e-

Ag+(aq) + e- --> Ag(s)

Overall cell reaction

Fe(s) + 2Ag+(aq) ---> Fe2+(aq) + 2Ag(s)

b. For electrolytic cell system,

Half-reactions,

Fe2+(aq) + 2e- --> Fe(s)

Ag(s) ---> Ag+(aq) + e-

Overall cell reaction

Fe2+(aq) + 2Ag(s) ---> Fe(s) + 2Ag+(aq)

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