- K2O2 + 2 K → 2 K2O
- 2 KNO3 + 10 K → 6 K2O + N2
- K2O + H2O → 2KOH
它会在空气中潮解。因此它对人体有腐蚀性。
在化肥包装上标的成分有时虽是写作K2O,但实际上是以氯化钾、硫酸钾或碳酸钾为肥料,再计算若以氧化钾为肥料时相应的分量。若一包肥料有30%的质量是氯化钾,它标出的分量便是19%。
参考资料
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