Test for carbon dioxide. The liquid in the test tube is a saturated solution of calcium hydroxide (limewater), which is colourless. When air is bubble

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Test for carbon dioxide. The liquid in the test tube is a saturated solution of calcium hydroxide (limewater), which is colourless. When air is bubbled into it through a glass straw the carbon dioxide will turn the limewater cloudy. This is because calcium carbonate is precipitated out as a white suspended solid.

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Photo credit: © MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -, background, biological, biology, blue, calcium, carbon, chemical, chemistry, colorless, colourless, dioxide, education, experiment, glass, hydroxide, lime, limewater, liquid, reaction, saturated, school, science, solution, straw, test, tube, water