Anelement that reacts with water and turns phenopthalene indicator pink
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Phenolphthalein stays colorless in acidic solutions and turns pink in alkaline solutions. Sodium hydroxide is a base, so when you add phenolphthalein, the solution turns pink. Other indicators commonly used in the laboratory are litmus and methyl orange.
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Lithium, sodium and potassium metals are added to water containing phenolphthalein indicator. The resulting metal hydroxide solutions change the indicator from clear to pink.
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