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Make Sodium Hydroxide by Electrolysis with a Nafion Membrane Cell
In this video we use a nafion membrane cell to make sodium hydroxide by electrolysis of sodium bicarbonate and separating and isolating the ions.
If you electrolyze water you generate hydroxide ions at the cathode, and hydronium ions at the anode. If you could some how split sodium bicarbonate, then mix the sodium ions with the hydroxide ions, you could make sodium hydroxide.
Of course "just" splitting ions completely glosses over the nuances and complexities of chemistry. But interestingly enough, a cationic exchange membrane like nafion essentially allows us to that by allowing cations to transfer through, but blocks anions.
To do this, all we do is get the nafion divided membrane cell we built in a previous video and insert it into a larger container of water and sodium bicarbonate. Using a titanium cathode and a cobalt oxide anode (although you can use nickel, platinum, or carbon), we make the sodium bicarbaonte solution the anolyte and use deionized water as the catholyte. Applying an electric current we separate the ions in sodium bicarbonate and pass the sodium through the membrane into the cathode side where they meet up with the hydroxide produced and create sodium hydroxide.
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