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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: aeacfm on April 23, 2011, 06:23:53 PM

Title: electrolysis of molten sulfates
Post by: aeacfm on April 23, 2011, 06:23:53 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
Title: Re: electrolysis of molten sulfates
Post by: DevaDevil on April 26, 2011, 03:42:24 PM: 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.
Title: Re: electrolysis of molten sulfates
Post by: Enthalpy on April 26, 2011, 07:43:48 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.
Title: Re: electrolysis of molten sulfates
Post by: aeacfm on April 27, 2011, 01:42:48 PM: Quote from: DevaDevil on April 26, 2011, 03:42:24 PM
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
Title: Re: electrolysis of molten sulfates
Post by: Borek on April 27, 2011, 06:16:01 PM: Quote from: DevaDevil on April 26, 2011, 03:42:24 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
Title: Re: electrolysis of molten sulfates
Post by: aeacfm on April 29, 2011, 12:25:12 PM: 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
Title: Re: electrolysis of molten sulfates
Post by: aeacfm on May 07, 2011, 08:47:59 PM: to ask the question in other words does sulfate ion has tendency to react at cathod (in aqueous solution )