Another attempt with distilling bromine from a solution of 15g KBr, 5.2g MnO2 and 24ml conc. HCl sol'n I cooled the receiver better.
It should theoretically yield 9.6g == 3ml of Br2, but I got about 2ml which is rather good.
Here the setup:
Some snow + NaCl in the beaker holding the receiving flask to get a freezing cold temperature at least below -7ºC the freezing point of Br2.
First I tapped 2ml of Br2 and did another run with the remaining reactant which still yielded a few Br2.
When I removed the receiving flask it looked like this: dark crystals on the bottom.
Is this frozen Br2 ?
[Edited on 2013-1-18 by metalresearcher]kristofvagyok - 18-1-2013 at 13:17
Maybe bromine-hydrate what could also form if a little water also passes through the condenser.woelen - 18-1-2013 at 13:31
Hard to tell from the picture. I agree with kristofvagyok. It could be solid Br2, but if the snow is not really cold (just a little under 0 C), then
it could be bromine hydrate. Bromine hydrate is unstable above a few degrees C, then it splits in water and free bromine.
