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My textbook says one of the functions of a salt bridge is that "it completes the circuit by allowing ions to move from one half-cell to another". However, according to my understanding, only the ions in the salt bridge move into the half-cells.
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Take the above chemical cell as an example, only the potassium ions and nitrate ions move into different half-cell respectively. The mobile ions in the two electrolyte do not move from one half-cell to another, right?

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  • $\begingroup$ That is correct, though some diffusion of the ions must occur, albeit slowly. $\endgroup$ – Zhe Jun 1 '17 at 13:56

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