[budullewraagh]

i got a red gas. smelled bad. not a good thing if it's in your room.
what could this be?

[limpet chicken]

I imagine, as I know you added H2O2, that it was iodine vapours, they are purplish colored.

Don't breathe it, its somewhat unhealthy.

[budullewraagh]

i hadnt added the peroxide by that time

[Donaldson Tan]

concentrated sulphuric acid can acts as an oxidising agent

[budullewraagh]

yeah, so i found out

[Mitch]

Sounds like iodine. But, iodine is more of a purple vapor.

[budullewraagh]

as i heard from others, it was bromine.  yes, apparently i had bromide impurities, which resulted in a red/brown/orange volatile gas that causes pulmonary edema.  i felt a little bit of the pulmonary edema setting in for an hour or so, but it has since subsided, as i wasnt exposed to much.

i now have a beaker of deep red solution.  could that be a combination of the tribromide and triiodide anions?

[kevins]

The deep red solution may be some iodine suspended in oily concentrated sulphuric acid.

[chloral]

What exactly are you trying to do/make, except causing injury to youself ?

[Garneck]

[Homer's voice]Mmmm, brooooomiiiide[/Homer's voice]

 

Get yourself some thiosulfate just in case.

[hmx9123]

Once you mix conc. sulfuric and hydrogen peroxide, you wind up with a highly oxidizing solution (peroxydisulfate anion, IIRC), commonly known as 'Pirhana Solution' in chem labs.  Nasty stuff.  Don't mix with any inorganics (<--- Should read 'organics') as you'll wind up creating unstable material.

[Borek]

Don't mix with any inorganics as you'll wind up creating unstable material.

You meant organics?

[hmx9123]

Um, yeah.  I have no idea why I wrote inorganics.

[miaskows]

Both HBr and especially HI easily oxidized by concentrated H2SO4 as follows:
2HBr+H2SO4 =B2 + SO2 +2H2O
The reaction is reversible, dilution of the mixture with H2O will shift the equilibrium to the left direction.
Well known fact that both Br2 and I2 could be used as reducers of SO2 in non concentrated water solutions.

[Mitch]

And depending on how much KI you were using. The normal purple vapors of I2 could look brown if you were going overboard.