Author Topic: Nice reaction under the x-mas tree  (Read 2210 times)

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politoxicomania

  • Guest
Nice reaction under the x-mas tree
« on: December 20, 2003, 01:37:00 PM »
Every year i search for imposante reactions to show them under the x-mas tree.
This year i found a reaction from the quantum chemistry.

Singulett Oxigenium

As some bees should know , oxigenium in the air has triplett electron konstitution. The energetically higher state is singulett. That means that the two antibinding electrons in the pi-MOs have antiparallel spin while located in one or two MOs-- both is called singulett but they differ also in energie.
Ther are two ways to yield singulett O2
photochemically or chemically
We will try the chemical way, to see the light emission at 633nm when the singulett reacts to triplett O2.
Singulett O2 can develop from peroxogroups.
We will use the Peroxohypochloridacid.

In a 100ml 2-neck flask equipped with fermenting tube and dropping funnel we penetrate 4 g KMnO4 with ca. 5ml conc. HCl solution from the funnel.

2 KMnO4 + 16 HCl --> 5 Cl2 + 8 H2O + 2 MnCl2 + 2KCl

The chlorine from this will react with an alkaline H2O2 solution in the fermenting tube.

Cl2 + 2 OH- --> Cl- + ClO- + H2O

The hypochloride will react with the H2O2

H2O2 + ClO- --> HOOCl + OH-

And in this stage the Peroxohypochloridacid will disintergrate fast

HOOCl --->  HCl  +  1O2

1O2 --> 3O2 + light 633nm (red)

A wonderful reaction and a wonderful light for x-mas.
Try it . ;D


Osmium

  • Guest
I've seen this once, Cl2 from a big bomb was...
« Reply #1 on: December 20, 2003, 02:42:00 PM »
I've seen this once, Cl2 from a big bomb was bubbled through a vertical 4 inch diameter glass pipe in a dark room. Very impressive.


sYnThOmAtIc

  • Guest
What was in teh tube?
« Reply #2 on: December 22, 2003, 10:10:00 AM »
Just Cl passing through a tub will emmit light? Or was there something in the tube. QUit being so tight with the details man it's X-mas give a lil... Thogh I know ou been givin this place alot for a long time but please do elaborate o'quiet one :)

Osmium

  • Guest
> Or was there something in the tube.
« Reply #3 on: December 22, 2003, 11:44:00 AM »
> Or was there something in the tube.

Well obviously an alkaline H2O2 solution.


sYnThOmAtIc

  • Guest
I should have known that would be the answer.
« Reply #4 on: December 22, 2003, 12:27:00 PM »
I should have known that would be the answer. Its late. I was jsut wondering if there were oter substances that might have been ther in its place. Being a novel bee and such.

politoxicomania

  • Guest
Alkaline H2O2 solution in the tube.....
« Reply #5 on: December 22, 2003, 04:45:00 PM »
Alkaline H2O2 solution in the tube should be a mixture of
KOH 3M : H2O2 (30%)   4:1  .
And this solution should be cooled down to 4°C.

merry x-mas


yellium

  • Guest
And this solution should be cooled down to...
« Reply #6 on: December 23, 2003, 06:25:00 PM »

And this solution should be cooled down to 4°C.


Why?

politoxicomania

  • Guest
And this solution should be cooled down to 4°C.
« Reply #7 on: December 23, 2003, 08:04:00 PM »
Just to slow down the disintegration of H2O2.

yellium

  • Guest
Bollocks. If you have to perform a reaction...
« Reply #8 on: December 23, 2003, 11:35:00 PM »
Bollocks. If you have to perform a reaction with it, you can heat H2O2 up to 70 degrees C (at which point you can visually see the reaction 2 H2O2 -> 2H2O +O2 taking place, but what else are you using 30% H2O2 for? :-). 

RT is fine enough, unless you want to store that solution for a week in the fridge.

politoxicomania

  • Guest
I ll pay 5€ for every exothermic reaction you...
« Reply #9 on: December 24, 2003, 11:35:00 AM »
I ll pay 5€ for every exothermic reaction you can find in this tube.
Also i ll pay 10€ if u can completly explain the surface reactions of H2O2 in alkaline solution at glass.
But to top this all, ill pay 50€ if u tell me why we store H2O2 in brown glass bottles.
And the question to win the 1.000.000 is:
Why the hell u dont believe that cooling down this solution would be an advantage?
  ::)


yellium

  • Guest
>I ll pay 5/10/50?
« Reply #10 on: December 26, 2003, 11:33:00 PM »

>I ll pay 5/10/50? for  (...)


Oi, I don't have to prove myself by answering every question a dicksize-challenged member of our valued community asks me. And I certainly don't want any money for that.



Why the hell u dont believe that cooling down this solution would be an advantage?


I'm not saying that it would be an advantage, I'm saying that it is not that necessary.

For example, if your reaction is exothermic, your solution will self-heat to whatever temperature, depending on concentration and volumes. Now, why did you carefully cool your solution to 4,00 'C?