Oh, ok, Thanks.
But check this one out.
H2SO4 + NH4Cl --> SO4 + HCl + NH6
Proof for SO4: Heavy sulphuric fumes came out of the est tube. It smelt terrible. Another option could be SO2.
Proof for HCl: I had a liquid that measured a pH of about 1 or 2.
Proof for NH6: Well, that's all the reactants that were left.
Is that correct? My proofs seemed convincing enough for myself, but are they for you?
Pierre
I agree with Borek. Please study some basic chemistry books and try to really understand what is going on.
When you add H2SO4 to NH4Cl, then the following reaction occurs:
NH4Cl + H2SO4 --> NH4HSO4 + HCl
With some heating you probably can go further:
2NH4Cl + H2SO4 --> (NH4)2SO4 + 2HCl
The 'heavy sulphuric fumes' you get do not contain any sulphur. This is the HCl, which escapes from the test tube as colorless gas. With humidity in the air, it forms a white fume, which consists of very small droplets of water, with a lot of HCl dissolved in it (in fact, the fume is hydrochloric acid, a.k.a. muriatic acid).
The same experiment can be done with plain table salt:
NaCl + H2SO4 --> NaHSO4 + HCl
Just do the experiment and you'll have a very similar result.
If you heat the mix of NH4Cl and H2SO4 very strongly, then you _might_ get some SO3, but before you get that, you have to heat really strongly (a few hundreds degrees centigrade), so it is unlikely that the fumes you obtained contain any SO3.