[zacher]

Hello guys. Is possible to get somehow from this reaction some molecule of iodine ? I need it in solid consistency. I want to make reaction I2 + NH3 then. Thanks for answer.

[Arkcon]

Hello guys. Is possible to get somehow from this reaction some molecule of iodine ?

No.  Hydrogen peroxide is a catalyst of the decomposition of hydrogen peroxide:  http://en.wikipedia.org/wiki/Elephant_toothpaste#Chemical_explanation

I need it in solid consistency.

Don't we all.  You can purchase it if you're affiliated with a university or commercial laboratory.  Its pretty in bulk, almost metallic in sheen, even 'tho its not a metal.  Note:  the purchaser may have to clear the purchase with a DEA form.

I want to make reaction I2 + NH3 then. Thanks for answer.

Wouldn't we all.  Its very touchy 'tho.  You never want more than a few crystals of nitrogen tri-iodide.

[zacher]

I know that main reaction is decomposition of peroxid. But I think there is also reaction KI + H2O2 --> KOH + I2...  what you think ?

[vmelkon]

You should get some hydrochloric acid as well. Preferably, high concentration. Hardware stores have 10 M HCl. The H2O2 should be high conc as well, but 3% will work just fine.

1. Make a saturated solution of KI. Warm up the water for maximum KI.
2. Add HCl. I think some KCl will precipitate.
3. Add the H2O2 and the solution will turn dark.
4. Decant and wash the iodine.
5. If you want, heat the liquid and distill off the iodine that is dissolved in the water.

The reaction is
KI(aq) + HCl(aq) -> KCl(aq) + HI(aq)
2 HI(aq) + H2O2 -> I2(s) + 2 H2O (iodide gets reduced, H2O2 gets oxidized)

[Borek]

Hydrogen peroxide is a catalyst of the decomposition of hydrogen peroxide

KI is a catalyst of the decomposition

2 HI(aq) + H2O2 -> I2(s) + 2 H2O (iodide gets reduced, H2O2 gets oxidized)

Quite the opposite

[zacher]

Thanks for advices. So I'm going to get som HCl and I will try to get some iodine from there.

[opsomath]

I am pretty sure we aren't allowed to talk about making explosives on here, right?

[Borek]

Which is why this thread can get closed any moment it crosses the line.

[vmelkon]

Yes, I got that mixed up. Iodide gets oxidized (loses 1 electron).

NI3 is very shock sensitive. A touch of a feather or wind sets it off and the sound is deafening from what I remember.

[zacher]

I know about NI3, I want to prepare only few crystals of it.. Just because I never prepared it before ...

[Borek]

Now that the intent is clear - topic locked.

Please read the forum rules.