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General Chemistry

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Electrochemistry

Question
7 out of 10
 

image\27460 ch 12 passage 1.png

By comparing standard reduction potentials, we can compare the reduction and oxidation powers of elements or ionic species. Some standard reduction potential values are given in Table 1.


In a galvanic cell, usually a salt bridge is used. What is the most likely purpose of this?

A To conduct electricity
B To prevent corrosion
C To regulate electricity
D To maintain neutrality in the half-cells
Ans. D Even though a salt bridge allows an electrical connection between the two half-cells in a galvanic cell, the function of a salt bridge is not to conduct electricity. So Choice A is ruled out. Choice B makes no sense. The salt bridge does not control the voltage. The function of a salt bridge is to maintain electrical neutrality in the half-cells so that excess buildup of charge will not occur in the half-cells. If excess charge builds up in the half-cells, the reaction will slow down and quickly die out.

Electrochemistry Flashcard List

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