In this video we make a two compartment electrolysis cell divided with a Nafion membrane.

Ever wish you could filter just one ion? Nafion is an ionic polymer or "ionomer" that has sulfonate functional groups as part of it's PTFE structure. These sulfonate groups make the nafion permeable to cations, very similar to cationic ion exchange resin. Cations can hop from sulfonate group to sulfonate group and transfer through the membrane. Anions are blocked.
So if we apply an electric field we can force cations through the membrane and separate them from anions.

In this video we make a single compartment membrane cell that we'll use in a future video to make sodium hydroxide from sodium bicarbonate.


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