vmelkon
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electrolisys of H2SO4 makes ozone?
I used 2 lead electrodes dipped in 31% wt H2SO4 solution. I used 6 V, 1 A.
It is weird. I smelled ozone. I tried it multiple times the next few days and every single time, there was a strong smell of ozone. I though that
oxygen is suppose to evolve from the anode but I guess a little ozone forms somehow.
Does anyone know anything about this?
And if no one knows, that's ok. It is new info for you.
[Edited on 13-8-2012 by vmelkon]
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hissingnoise
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Electrolytic ozone is well known and has a long history.
Useful quantities of ozone are produced using insoluble anodes.
Base-metals anodes produce negligible amounts of the gas!
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AndersHoveland
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Not really surprising. The electrolysis is probably producing some persulfate ions, which are are known to be able to decompose into ozone.
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By the thermal decomposition of the persulphates, small quantities of ozone can be obtained. 20 grams of dry freshly prepared ammonium persulfate are
mixed with 15 gms. of nitric acid in a small flask. The air is subsequently displaced by carbon dioxide, and the mixture cautiously raised to 65° to
70° C. The reaction, which is strongly exothermic, proceeds somewhat vigorously when once started, and the resulting oxygen, after removal of the
carbon dioxide, contains 3 to 5 per cent, of ozone and small quantities of nitrogen. Malaquin (" J. Pharm. Chem.," VII, 3, 329, 1911)
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Production of persulfate by electrolysis of sulfate:
http://www.sciencemadness.org/talk/viewthread.php?tid=11022
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vmelkon
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Thanks for the responses.
AndersHoveland, the thread is interesting but there isn't any mention of ozone production.
For the thermal decomposition of a persulfate, yes, I was aware of that. You can also use sodium persulfate and a catalytic amount of H2SO4 to make
oxygen and a little bit of ozone gets produced too when the persulfate is heated.
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