Salt bridge and migration of ions
The salt bridge is used as a means of migrating ions between the two half-cells in order to maintain electrical neutrality. Although, when referring to the process of how it does it between Kamal's notes and the Conquering chem textbook, I'm a little confused on which one to pick.
In the notes:
"The salt bridge is soaked in potassium nitrate solution: Thus, as the positive charge builds up in the left cell, NEGATIVE nitrate ions migrate towards the cell to neutralise the charge; as the negative charge builds up in the right cell, the POSITIVE potassium ions move towards the cell to neutralise it as well."
Okay so from here it's saying that the potassium and nitrate ions of the electrolyte solution in the salt bridge move into either of the two half-cells.
In the conquering chem textbook:
"Both positive and negative ions migrate through the salt bridge. In Figure 2.2 not only do nitrate ions migrate from the right-hand beaker into the left-hand one, but also positive ions migrate from left to right. Copper ions move into the salt bridge and ‘push’ potassium ions out into the silver nitrate solution. This migration preserves electrical neutrality in both beakers (half-cells)."
Here is figure 2.2:
From what I'm interpreting from the textbook, I see it that ions from the two half cells migrate through the salt bridge in which this also pushes out the necessary charged ions into the specific half cell to attain electrical neutrality.
TL;DR: Is it the ions alone in the electrolyte solution of the salt bridge that move into the half-cells to achieve electrical neutrality? Or is it the ions within the half cells as well as the ions within the electrolyte solution of the salt bridge that migrate to the specific half-cell to achieve electrical neutrality?
Sorry if this seems quite convoluted in expression, I tried to make it easy to understand :s
