Potassium oxide

This pale yellow solid is the simplest oxide of potassium.

Some industrial materials, such as fertilizers and cements, are assayed assuming the percent composition that would be equivalent to K2O.

[6][7] K2O is a basic oxide and reacts with water violently to produce the caustic potassium hydroxide.

It is deliquescent and will absorb water from the atmosphere, initiating this vigorous reaction.

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Potassium Oxide spacefilling model
Potassium Oxide spacefilling model
NFPA 704 four-colored diamond Health 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gas Flammability 0: Will not burn. E.g. water Instability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calcium Special hazard W: Reacts with water in an unusual or dangerous manner. E.g. sodium, sulfuric acid