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Homework Help: Electrolysis of a molten sulphate

  1. Aug 28, 2010 #1
    During the electrolysis of a molten sulphate, for example Chromium sulphate. At the cathode, chromium forms but what forms at the anode? Is it sulphur dioxide and oxygen?
     
  2. jcsd
  3. Aug 28, 2010 #2

    Borek

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    Staff: Mentor

    Peroxodisulfate? Why dioxide and not trioxide?

    But honestly I am just thinking aloud.
     
    Last edited by a moderator: Aug 13, 2013
  4. Aug 29, 2010 #3
    Wow, that comment confused me more :D
     
  5. Aug 29, 2010 #4

    Borek

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    Staff: Mentor

    Electrolytic oxidation of sulfate to peroxodisulfate in water solution is part of the old method of a hydrogen peroxide production, no idea if it will happen in molten state as well - but perhaps it can.

    To get sulfur dioxide you need to reduce sulfur from VI to IV, and reduction at anode doesn't sound plausible to me. On the other hand oxidation of oxygen and production of SO3

    2SO42- -> 2SO3 + O2 + 4e-

    seems to be reasonable idea.

    But this is just shifting of the atoms on paper, reality can be completely different.
     
    Last edited by a moderator: Aug 13, 2013
  6. Aug 29, 2010 #5
    Thanks :)
     
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