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Calcium reacting with water, later stage

Calcium reacting with water, later stage

C040/2668

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Calcium reacting with water, later stage. Calcium metal (Ca) reacts vigorously with water (H2O), producing hydrogen gas (H2) bubbles and slightly soluble calcium hydroxide (Ca(OH)2): Ca + H2O -> Ca(OH)2 + H2. Here, a piece of calcium has been dropped into a test tube with water. Calcium first sinks (see C040/2666) but then bubbles up due to the hydrogen gas produced. Calcium hydroxide is later seen as white precipitate, as seen here.

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