Positive test for carbon dioxide

Positive test for carbon dioxide

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This image is part of the sequence Science and technology: Test for carbon dioxide

Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Positive 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 turns the limewater cloudy. This is because calcium carbonate is precipitated out as a white suspended solid.

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Keywords: biological, biology, blue background, calcium carbonate, calcium hydroxide, carbon dioxide, chemical, chemistry, cloudy, colorless, colourless, experiment, glass straw, lime water, limewater, liquid, no-one, nobody, precipitate, reaction, saturated, school science, science education, solution, suspended solid, test, test tube, white

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