Make Potassium Chlorate from Bleach

Uploaded by NurdRage on 26.08.2010

Greetings fellow nerds.
In this video we're going to make potassium chlorate from bleach.
The procedure is very simple,
first start with a large quantity of chlorine bleach,
the higher the percentage the better.
I'm using about half a liter,
which is about the minimum for this to be useful.
Now just simply heat it up until it boils and keep boiling to get rid of most of the water.
What's happening is the sodium hypochlorite is disproportionating
into sodium chloride and sodium chlorate.
This reaction only happens with boiling so you cannot simply evaporate it.
Anyway, keep going until you just start to see crystals forming.
At this point stop immediately, take it off heating, and let it cool.
Now get potassium chloride, which is available as a salt substitute.
Make sure it has no sodium for best results,
and make a saturated solution out of it.
Now get the boiled bleach solution
and measure out an equal volume of the saturated potassium chloride solution.
Mix both solutions but don't transfer the crystallized sodium chloride from the bleach.
Now stir up the mixture.
What's happening is we're exchanging the ions in the potassium chloride
and sodium chlorate to make sodium chloride and potassium chlorate.
The potassium chlorate will precipitate out while the sodium chloride stays in solution.
To increase yield slightly it's best cool the mixture in the freezer.
After it's been cooled, filter the mixture and keep the crystals.
Dry them out and then you'll get potassium chlorate.
To test it you can mix it with half its mass of sugar
and then add a few drops of sulfuric acid.
Now this way of making potassium chlorate is not very efficient.
A much better way is through electrolysis that I’ll show in a later video.
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