File:Potassium & water 39.jpg

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English: Potassium reacting violently with water. Hydrogen is formed that ignites with a lilac flame; the flame color owing to burning potassium vapor. Strongly alkaline potassium hydroxide is formed in solution, turning phenolphthalein indicator solution violet red.
中文：钾和水剧烈反应，放出氢气并自燃，带有紫色火焰，火焰的颜色来自钾蒸气。反应生成强碱性的氢氧化钾，可以让酚酞指示剂变红。
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Author Ozone aurora / Philip Evans
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current18:59, 5 April 2010Thumbnail for version as of 18:59, 5 April 2010740 × 920 (142 KB)Ozone aurora (talk | contribs){{Information |Description={{en|1=Potassium reacting violently with water. Hydrogen is formed that ignites with a lilac flame; the flame color owing to burning potassium vapor. Strongly alkaline potassium hydroxide is formed in solution, turning phenolpht

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