Slovo
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Povidone iodine question
My question is what are the reactions that are happening when povidone iodine reacts with KOH then,products react with HCL and finally products of
that reaction with H2O2.
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Milan
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In povidone iodine I think only iodine should be reactive towards KOH.
Here's an extract from wikipedia:
"It can also be prepared by adding iodine to a hot, concentrated solution of potassium hydroxide.
3 I2 + 6 KOH → KIO3 + 5 KI + 3 H2O"
Also I found this thread: http://www.sciencemadness.org/talk/post.php?action=reply&...
Quote: Originally posted by AJKOER  | On the reduction:
Low Acid Concentration:
5 KI + KIO3 + 6 HCl --> 6 KCl + 3 I2 + 3 H2O
But in high acid concentration:
2 KI + KIO3 + 6 HCl --> 3 KCl + 3 ICl + 3 H2O
and ICl + H2O --> HOI + HCl
But immediately:
5 HOI --> 2 H2O + 2 I2 + HIO3
Source, per my notes, is Mellor, around page 118.
I suspect your source of KIO3 actually already has some KI. My speculation is based on:
3 I2 + 3 H2O <-----> 5 HI + HIO3
and upon adding KOH, produces KI and KIO3. Potassium iodate is reportedly prepared by the anodic oxidation of a KI solution. My attempt at this:
KI + H2O <---> KOH + HI
4 HI + O2 --> 2 H2O + 2 I2
and again we have Iodine and water plus KOH.
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Working with solid KIO3, one could attempt a thermal decomposition (between 655 to 736 K):
KIO3 --> KI + 3/2 O2
Also, a reported secondary reaction:
4 KIO3 --> 2 K2O + 2 I2 + 5 O2
so be prepared to condensed escaping Iodine.
Source: "High temperature properties and thermal decomposition of inorganic salts ..." by Kurt H. Stern, page 248.
Link:
http://books.google.com/books?id=2BpMo7HpXzIC&pg=PA248&a...
Then, treat the Potassium iodide with Chlorine:
2 KI + Cl2 --> KCl + I2
or, one could theoretically use the KI to seed the first procedure that requires some KI.
Let me know what happens.
[Edited on 13-1-2012 by AJKOER] |
As for H2O2 there's this thread about interaction between H2O2 and I2: http://www.sciencemadness.org/talk/viewthread.php?tid=18302
As for KCl I found this webpage: http://chemistry.stackexchange.com/questions/6032/potassium-...
It says the KCl would be oxidised to chlorine gas?(though I'm not sure about this).
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