What Forms at the Anode During Electrolysis of Molten Chromium Sulphate?

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Discussion Overview

The discussion centers on the products formed at the anode during the electrolysis of molten chromium sulfate. Participants explore various chemical species that may be generated, including sulfur dioxide, oxygen, and peroxodisulfate, while considering the implications of these reactions in both molten and aqueous states.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that sulfur dioxide and oxygen may form at the anode during the electrolysis of molten chromium sulfate.
  • Another participant questions the formation of sulfur dioxide, proposing peroxodisulfate instead, and wonders why sulfur dioxide is considered rather than sulfur trioxide.
  • A different participant expresses confusion regarding the previous comments, indicating a lack of clarity in the discussion.
  • One participant discusses the electrolytic oxidation of sulfate to peroxodisulfate in aqueous solutions, noting uncertainty about whether this reaction occurs in the molten state, while also suggesting that the oxidation of sulfate could lead to sulfur trioxide and oxygen production.
  • This participant points out that reducing sulfur from oxidation state VI to IV at the anode seems implausible, raising questions about the feasibility of the proposed reactions.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the products formed at the anode, with multiple competing views and uncertainties remaining regarding the reactions involved.

Contextual Notes

Participants express uncertainty about the reactions occurring in the molten state versus aqueous solutions, and there are unresolved questions regarding the oxidation states of sulfur and the plausibility of certain reactions.

yvan300
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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?
 
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Peroxodisulfate? Why dioxide and not trioxide?

But honestly I am just thinking aloud.
 
Last edited by a moderator:
Wow, that comment confused me more :D
 
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.
 
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Thanks :)
 

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