Make Potassium Chlorate From Bleach





Introduction: 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.



    • Epilog Challenge 9

      Epilog Challenge 9
    • Paper Contest 2018

      Paper Contest 2018
    • Pocket-Sized Contest

      Pocket-Sized Contest

    We have a be nice policy.
    Please be positive and constructive.




    haha combine a gummy bear with potassium chlorate

    haha combine a gummy bear with potassium chlorate

    Potassium chlorate crystals for me is very useful since I can test this on friendly bacteria with a plot Ph vs time (in hours). Potassium and sodium chlorate interfere with glycolysis.

    You know although it is a bit more dangerous you can make potassium chlorate by using calcium hypochlorite and potassium chloride.


    First boil a solution of calcium hypochlorite 10%. Warning both Chlorine (Cl2) and HCl gas are produced so do this in a well ventilated area. Allow the boiled solution reach 90 degrees C (constant very important). Then added the potassium chloride you should get potassium chlorate and calcium chloride. Boil for approx 3 hours. Potassium chlorate in not or sparsely soluble in cold water. Soluble in warmer water and this is the key on how to separate them. Wash the KClO3 with cold water for min loss of the product.

    This info came from Red Nile and all info about safety should be followed including waste disposal.


    question for you. I have calcium hypochlorite (HTH) pool shock that can be dissolved into water to make a "bleach" solution. Will this product work as the sodium hypochlorite does or is the sodium necessary in the chlorite to work?

    I'd like to know how much precipitate was made at the end so I can modify to make just under 5 grams of KClO3

    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 should use a screen between the beaker and the flame or hot plate. Even with Pyrex or Kimax glass, an application of intense heat to a small area of the beaker can cause it to expand locally, thereby fracturing the beaker. Heat should be applied slowly and evenly which is usually done with an electric hot plate.

    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...

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