Caesium is a soft, silvery-gold alkali metal (Z55) that reacts violently when exposed to water to form caesium hydroxide (CsOH). In this example, phenolphthalein has been added to the water bath to highlight the resulting change in pH. Because caesium hydroxide is a strong base, it causes the phenolphthalein indicator to change colors to a vivid pink/purple.
Source: https://youtu.be/_zPH0rdZrJY
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