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Topic: 70% KCl, 30%NaCl Elecrtrolysis  (Read 2161 times)

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Offline xXCuteGoatXx

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70% KCl, 30%NaCl Elecrtrolysis
« on: July 24, 2017, 06:35:37 PM »
Hi!
If I wanted to create potassium chlorate (KClO3) by doing electrolysis of salt containing 70% KCl and 30% NaCl, would the sodium chloride in any way prevent the reaction to form chlorates?

Cathode:
2H2O + 2e- ->  H2 + 2OH-

Anode:
2OH- +  Cl- -> ClO- + 2e-

Overall:
H2O + KCl -> KClO + H2

Chlorine side reaction (overall which will increase pH):
2KCl + 2H2O -> 2KOH + H2 + Cl2

Reaction when the solution reaches high pH:

12ClO- + 12OH- -> 3KClO +18H2 + 3O2

THE OVERALL REACTION:
18H2O + 4KCl -> 4KClO3 + 18H2 + 3O2

Now, I'm wondering if the sodium from NaCl will prevent this reaction by reacting with OH- to form sodium hydroxide? If this happens, will there be significantly less KClO3 created or none at all? If so, why would that be?

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