[yg7s7]

What's the difference between the two, and when should each be used?
For example, Desulfonation involves aqueous acid with heat, and what is the role of H2O?
Why can't just H2SO4 be used?

[kimyacı]

 The pure H2SO4 solution involve only H2SO4 molecules but H2SO4 aqueous solution involve H30+  and  HSO4-
 
 Sulfonation is an equilibrium reaction; all steps involved are equilibria
The sulfonation product is favored by use of concentrated or fuming sulfuric acid
Desulfonation can be accomplished using dilute sulfuric acid (i.e. with a high concentration of water), [/img] [/img] [/flash] or by passing steam through the reaction and collecting the volatile desulfonated compound as it distils with the steam

   

[yg7s7]

thank you kimyacı !!