zephler - 4-12-2010 at 22:18
Since I've only ever seen 33% HBr in acetic acid, I assume this is the strongest you can get (although I thought I did see 70% once - oh well). If
one were to have Br2 in cold glacial AA, could you just bubble H2 through the solution and get the required conc of HBr in GAA?
chemrox - 4-12-2010 at 22:59
look up how HBr is made in one of the texts like Vogels
Picric-A - 5-12-2010 at 07:19
Saturate GAA with bromine then pass in a steady stream of SO2. You should be left with a conc solution of HBr in GAA with a H2SO4.
woelen - 5-12-2010 at 12:06
Where should the hydrogens come from? Br2 and SO2 do not react under these conditions. For each molecule of Br2 you also have to add a molecule of
H2O.
Vogelzang - 6-12-2010 at 16:05
How about this?
http://www.sciencemadness.org/talk/viewthread.php?tid=10576#...
woelen - 7-12-2010 at 01:05
Yes, this works. I have tried it myself and you can make pure HBr without formation of any bromine. The only drawback is that you need a large excess
of phosphoric acid, otherwise you need very high temperatures for driving off all HBr and that is hard on glass apparatus (glass and phosphoric acid
do not go together very well when the temperature gets high).