thereelstory - 24-1-2010 at 09:37
any one have an idea for a prep for this? ultimately looking to prep h202. any suggestions?
thanks in advance.
UnintentionalChaos - 24-1-2010 at 11:29
Ammonia + H2SO4. Ta-da!
bahamuth - 24-1-2010 at 11:45
A quick search on the net revealed that ammonium bisulfate is formed during thermal decomposition of ammonium sulfate at 100 degrees Celsius in an
open system, which simplifies the synthesis.
woelen - 25-1-2010 at 01:13
I have made around 100 grams of this compound, and I found it to be amazingly hygroscopic. Even in a closed vessel the crystals, sticking to the glass
walls liquefy in one day. Making this material is easy, you can make it from ammonia and sulphuric acid, I however, used dry ammonium sulfate and
sulphuric acid (slight excess of ammonium sulfate was used).
I made a solution of the material in water and then allowed this to evaporate on a dry warm place. After a few days you get a crystalline mass (fairly
big colorless crystals are formed, 2 mm diameter or so). When only a small amount of liquid remains, then decant that liquid from the crystalline mass
and put the crystals on a sintered glass filter to have most of the adhering liquid absorbed. After that tratment, put the crystals in a warm place
(40 C) for a few days and every day turn around the crystals with a glass rod to expose other parts of the solid to dry air. After a few days you have
a nice dry product, which is not sticky at all.
I transferred the solid to a glass bottle with a plastic screw cap. Unfortunately, already after one day of storage, the stuff was somewhat sticky
again, and crystals which were sticking at the top part of the glass bottle had changed into droplets of colorless liquid. So, it is VERY hard to
store this chemical such that it remains dry. A concentrated solution of it in water of course easily can be stored.