Discussion
In the cell notation Zn | Zn\( ^{2+} \) || Cu\( ^{2+} \) | Cu, the double vertical line represents
Answer: C
Correct answer: the salt bridge or liquid junction
A single vertical line marks a phase boundary within a half cell, such as metal against its solution; the double line marks the salt bridge or liquid junction separating the two half cells. The bridge completes the circuit by carrying ions while preventing the two solutions from mixing, and it keeps the liquid junction potential small by using an electrolyte whose cation and anion have nearly equal mobilities, such as potassium chloride.
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