Interaction | Reaction | Process     Data Page

The peroxodisulfate(VI) ion reacts with iodide ion to give sulfate ion and iodine. However, the reaction is very slow even though it is energetically favorable. The reason is that both ions have a net negative charge, they repel each other and so are unlikely to collide.

The reaction is catalysed with Fe2+ ions. V3+ ions can also be employed.
  +  
2
I–
  +  
Fe2+
         
2
[SO4]2–
  +  
I2
Reactant Page Go To Go To
Peroxodisulfate(VI) ion     Reactions Using    Reactions Forming
Iodide ion     Reactions Using    Reactions Forming
Iron(II) ion Catalyst    Reactions Using    Reactions Forming
Sulfate ion     Reactions Using    Reactions Forming
Iodine     Reactions Using    Reactions Forming

Interaction, Reaction, Process defined as:
British A-Level Chemistry: A2
Redox
Reduction: Of Substrate By Reagent

© Mark R. Leach 1999 –

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