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Author Topic: electrolysis of molten sulfates  (Read 4133 times)

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aeacfm

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electrolysis of molten sulfates
« on: April 23, 2011, 12:23:53 PM »

what is the result of electrolysis of molten sulfates ? i mean at the anode

i think it would be S ulfur and oxygen or SO2 also and oxygen
can some one correct
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DevaDevil

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Re: electrolysis of molten sulfates
« Reply #1 on: April 26, 2011, 09:42:24 AM »

in electrolysis, the anode will have the oxidation reaction.

Sulfate oxidation is not possible as far as I know, as with oxidation state of 6+, sulfur is in its most oxidized form.
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Enthalpy

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Re: electrolysis of molten sulfates
« Reply #2 on: April 26, 2011, 01:43:48 PM »

I'd have said O2 and SO2 SO3, but ONLY IF these highly corrosive species don't corrode the anode, which must be extremely difficult with hot oxygen, more so as it tends to be partially atomic when evolving.
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aeacfm

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Re: electrolysis of molten sulfates
« Reply #3 on: April 27, 2011, 07:42:48 AM »

Sulfate oxidation is not possible as far as I know, as with oxidation state of 6+, sulfur is in its most oxidized form.

great sir , so do reduction of sulfate ( electrochemically not by bacteria ) possible . i hope
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Borek

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Re: electrolysis of molten sulfates
« Reply #4 on: April 27, 2011, 12:16:01 PM »

Sulfate oxidation is not possible as far as I know, as with oxidation state of 6+, sulfur is in its most oxidized form.

http://en.wikipedia.org/wiki/Potassium_persulfate
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aeacfm

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Re: electrolysis of molten sulfates
« Reply #5 on: April 29, 2011, 06:25:12 AM »

Great , does this step possible in aqueous solutions

Quote
Potassium persulfate can be prepared by electrolysis of a mixture between potassium sulfate and hydrogen sulfate at a high current density.

2 KHSO4 → K2S2O8 + H2
It can also be prepared by adding potassium bisulfate (KHSO4) to an electrolyzed solution of ammonium bisulfate (NH4HSO4).

Another reaction of its formation is the following (although the practical use of it is doubtable).

F2 + 2KHSO4 → K2S2O6(O2) + 2HF


or only in melts 
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aeacfm

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Re: electrolysis of molten sulfates
« Reply #6 on: May 07, 2011, 02:47:59 PM »

to ask the question in other words does  sulfate ion has tendency to react at cathod (in aqueous solution )
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