Make Potassium Chlorate from Bleach

video Make Potassium Chlorate from Bleach
How to Make Potassium Chlorate from Bleach and sodium-free salt.

Warning: This produces small amounts of chlorine gas, this should be done outside or in a fumehood.

Potassium chlorate is a useful oxidizer and small amounts can be easily made using household chemicals. Start by boiling a large quantity of household laundry bleach, at least half a liter, until crystals start to precipitate. Immediately take it off heating and let it cool. As it cools make a saturated solution of potassium chloride. Potassium chloride is sold as a "sodium-free" salt substitute. Now once the bleach is cooled, measure out an equal volume of potassium chloride solution and pour into the boiled bleach solution but do not mix in the crystals. Stir up the mixture and eventually potassium chlorate crystals will precpitate out.

What's happening is the sodium hypochlorite in the bleach is disproportionating to form sodium chloride and sodium chlorate. Adding the potassium chloride exchanges the ions and precipitates out potassium chlorate.

The boiling is required for this reaction to work; you can't simply let the bleach evaporate.
zelback12 years ago
What do you saturate the potassium chloride with? or is it just the salt served up dry?
(removed by author or community request)

I believes he was saying "Make a Saturated Solution of Potassium Chloride" not to saturate the Potassium Chloride...

phevtron2 years ago
may i ask a question ? i am amateur with chemistry so i dont have this equipment (special hot plate) , i tried to heat the beaker on my cookers plate but broke, can you please tell me another way to boil the bleach without breaking the beaker ?

You would need Pyrex Glass for the beaker to not break, but you should be able to boil the bleach in any Teflon Lined container ( it resist up to 100% sodium Hypocholrate concentrations so you should be good, but I would not recommend eating out of it after...

comsa421 year ago
A slower, yet much more safer and tedious way is to do this using electrolysis. Check out this guide for more:

It's really useful to know if you have a bit of platinum or a ton of graphite!
I'm going to try this, except, I'll make CESIUM CHLORATE. I got my hands on some Cesium Chloride, so, I can make CsClO3, and blow up old computers and stuff.
where did you get cesium chloride?!?!?!?!
don't see it and didn't hear it mentioned
comment above
potassium chlorate makes a wonderful oxidizer. potassium nitrate is good as well. but potassium perchlorate isn't. even though it holds more oxygen ions (KClO4) it isn't a good oxidizer. can anyone explain?
lemonie3 years ago

These chlorates are hazardous, a spill has the potential to cause an unplanned fire. I'd worry more about that than chlorine myself.

ac1D3 years ago
I look forward the electrolysis video!
onid19673 years ago
Great Video & great instructions. You know your stuff. I bow to the master.
rimar20003 years ago
Good work, as always, NurdRage!

Get More Out of Instructables

Already have an Account?


PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format. You also have the ability to customize your PDF download.

Upgrade to Pro today!