What is the Role of Diaphragms in Charge Transfer in Chemistry?

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In basic chemistry, diaphragms are crucial for preventing the mixing of solutions in half-cells while allowing ionic conductivity. The charge is carried through the diaphragm not by electrons or the ions from the solution, but through a mechanism that typically involves the selective movement of ions that do not directly react with each other. This design ensures that the ions traveling through the membrane are specifically chosen to avoid unwanted reactions, suggesting that the diaphragm functions similarly to a double ion exchanger. This selective ion transport is essential for maintaining the integrity and efficiency of electrochemical systems.
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In basic chemistry courses you will learn that diaphragm prevents mixing of solutions between half-cells while maintaining ionic conductivity. What exactly carries charge through diaphragm if it's neither electrons, nor ions from the solution? What is the molecular mechanism behind that?
 
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Ions do travel through the membrane. However, you usually design the system in such a way that traveling ions are those that will not react directly.
 
Borek said:
Ions do travel through the membrane. However, you usually design the system in such a way that traveling ions are those that will not react directly.

So it's some kind of (double) ion exchanger?
 

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