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Electrolysis of potassium iodide
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Topic: Electrolysis of potassium iodide (Read 1033 times)
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bear_007
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Electrolysis of potassium iodide
«
on:
August 03, 2020, 11:55:02 AM »
Iodine gas forms at Anode but hydroxyl ion is more reactive in the electrochemical series so it should electrolyse and for, oxygen, I assume if that is what is formed by hydroxyl ion, correct me if I am wrong.
Why iodine and not oxygen?
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Borek
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Re: Electrolysis of potassium iodide
«
Reply #1 on:
August 03, 2020, 06:22:13 PM »
Most often it is kinetics, oxygen is notoriously slow and requires overpotential to react faster.
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ChemBuddy
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bear_007
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Re: Electrolysis of potassium iodide
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Reply #2 on:
August 06, 2020, 01:42:34 PM »
thanks
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Enthalpy
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Re: Electrolysis of potassium iodide
«
Reply #3 on:
August 06, 2020, 02:47:54 PM »
I don't quite grasp the "more reactive" argument.
The electrolyte contains mainly K
+
and I
-
. These are the ions attracted by the electrodes. H
+
and OH
-
are rare in a neutral solution.
At the electrodes, other compounds can evolve if the neutralised ions decompose water or combine in some other way. For instance K doesn't remain metallic in water, so you can obtain hydrogen and keep K
+
. But with iodine? I could at most imagine the formation of a hypoiodide. I don't imagine iodine in water forming something like HI and O
2
. Or did I get it wrongly?
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Electrolysis of potassium iodide