Calcium oxide reacts with water

Calcium oxide reacts with water

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Caption: Calcium oxide reacts with water. A small amount of calcium oxide (CaO, quicklime) in a test tube is mixed with water. Calcium hydroxide (Ca(OH)2, hydrated lime or caustic lime or slaked lime) is produced in the exothermic reaction: CaO + H2O -> Ca(OH)2. This process is known as slaking. Calcium hydroxide is poorly soluble in water. It still produces enough hydroxide ions to turn phenolphthalein indicator pink, indicating an alkaline resulting solution.

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Keywords: alkaline, basic, calcium hydroxide, calcium oxide, cao, caoh2, chemical, chemistry, chemistry experiment, h2o, hydroxide, indicator, lime, oxide, phenolphthalein, quicklime, reaction, reactivity, slaked lime, slaking, synthesis, test tube, water

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