Production
The compound is industrially produced by passing chlorine into the hot milk of lime, subsequently adding the potassium chloride (Liebig process). The electrolysis of KCl water solution is also used sometimes, then the chlorine formed at the anode reacts with KOH in situ. As KClO3 solubility in water decreases significantly when cooling, it can be simply isolated from the reaction mixture.
Can be produced in small amounts by disproportionation a sodium hypochlorite solution followed by metathesis reaction with potassium chloride:
- 3 NaOCl → 2NaCl + NaClO3
- KCl + NaClO3 → NaCl + KClO3
Can also be produced by passing chlorine gas into a hot solution of caustic potash:
- 3Cl2(g) + 6KOH (aq) → KClO3 (aq) + 5KCl (aq) + 3H2O(l)
Read more about this topic: Potassium Chlorate
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