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28.7 x 43.4 cm ⏐ 11.3 x 17.1 in (300dpi)
GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
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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