Calcium Oxide Reacts with Water, 2 of 3

Calcium Oxide Reacts with Water, 2 of 3

C039/1307

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Caption

Calcium oxide reacts with water, 2 of 3. A small amount of powdered solid calcium oxide (CaO, quicklime) is poured into a beaker with water. The water has few drops of universal indicator added. Initially the colour is green, indicating a neutral solution. 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 universal indicator blue, indicating an alkaline resulting solution.

Release details

Model release not required. Property release not required.

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