Introduction This method of potassium chlorate preparation is mostly for fun, and can be dangerous if proper precautions are not taken. Though precursors are expensive, the method can be upscaled. 3K2CO3 + 3Cl2 ==> 5KCl + KClO3 + 3CO2 Procedure Materials: Potassium carbonate (K2CO3) Chlorine source (Cl2) Add 35 ml water and 50 g K2CO3 into a baker and bring it to gentle boiling. Attach throat of a funnel to chlorine source and immerse it up side down into solution as on picture below. Pass a gentle chlorine flow. If a bubbler or a simple pipe were used instead of the funnel, the small hole(s) would be tapped pretty fast by solid products of reaction. Solution is preferably stirred during whole reaction with a magnetic stirrer and level of liquid is restored from time to time with water. Reaction is ceased when carbonate ion disappears (test small drops of solution with HCl). Although chlorine will be absorbed by solution effectively, it's recommended to make whole procedure outside. During my experiment nearly no chlorine smell was detected in the beginning, though smell became stronger closer to the end of reaction. In the end of reaction, continue boiling solution while adding water in small portions until all solid dissolves. Chill to 0oC, filter and wash obtained crystalls with small portion of cold water on filter. Recrystallize obtained solid from hot water, chill and filter as above. The theoretical yield is approx. 15 g KClO3, though some will be lost during recrystallizations. References 1. N.G.Kluchnikov, Practical works in nonorganic synthesis, 2:nd ed., 1979