- K2O2 + 2 K → 2 K2O
- 2 KNO3 + 10 K → 6 K2O + N2
- K2O + H2O → 2KOH
它會在空氣中潮解。因此它對人體有腐蝕性。
在化肥包裝上標的成份有時雖是寫作K2O,但實際上是以氯化鉀、硫酸鉀或碳酸鉀為肥料,再計算若以氧化鉀為肥料時相應的份量。若一包肥料有30%的質量是氯化鉀,它標出的份量便是19%。
參考資料
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