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YT2095
International Hazard
Posts: 1091
Registered: 31-5-2003
Location: Just left of Europe and down a bit.
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Mood: within Nominal Parameters
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well that`s Handy to know. I wanted to make some Calcium Bromate and Chlorate, it`s suposed to give a nice Pink flame, somewhat different to K and Sr
mixes.
thus far the only method I have is electrolysis with periodic current reversal every 30 secs to stop the Cathode from getting caked in crap, it would
nice to have a more elegant method 
\"In a world full of wonders mankind has managed to invent boredom\" - Death
Twinkies don\'t have a shelf life. They have a half-life! -Caine (a friend of mine)
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woelen
Super Administrator
Posts: 8012
Registered: 20-8-2005
Location: Netherlands
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Unfortunately, I only have found a satisfactory way to make KBrO3, AgBrO3, and Ba(BrO3)2. Other bromates are very soluble, and making calciumbromate
is really hard. It simply is not formed from solution, because any other calcium salt will settle first from solution.
One could make Ba(BrO3)2, dissolve this in boiling hot water, add dilute sulphuric acid to precipitate BaSO4 and have HBrO3 in solution, and then add
CaCO3 or Ca(OH)2 to this, one could also add other metal carbonates or hydroxide/oxides. But going this way is very cumbersome. Preparing a solution
of HBrO3 without traces of Ba(BrO3)2 or traces of excess H2SO4 will be really hard, unless you have very precise equipment and want to take the
painstakingly precise effort to prepare a solution of H2SO4, with very precisely determined concentration.
Making Ca(ClO3)2 or Ca(BrO3)2 by electrolysis of a solution of CaCl2 or CaBr2 seems a very cumbersome thing to me also. You get solid Ca(OH)2 all the
time around the cathode, which really clogs up the thing. This is not the way to go for making the chlorate or bromate to my opinion.
Btw, I changed my page on making KBrO3, it now has the explanation of the fine carbon particles in it. If I have some silica, then I will try the
method of Runaway on a test tube scale. But first I need to obtain suitable silica.
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woelen
Super Administrator
Posts: 8012
Registered: 20-8-2005
Location: Netherlands
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Mood: interested
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This is the result with the barium bromate:
http://woelen.scheikunde.net/science/chem/exps/barium_bromat...
Really nice green light.
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