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The reaction between potassium and oxygen

Potassium + Oxygen Potassium oxide
4K + O2 2K2O



When heated potassium produces a purple flame 

Potassium burns with a lilac or light purple coloured flame. The potassium oxide that results from the reaction is a pale yellow colour. Potassium oxide is highly reactive. When potassium oxide reacts with water it forms potassium hydroxide, an alkaline solution with a pH of between 13 and 14.

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