Carbon dioxide test

Carbon dioxide test

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Credit: ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: Carbon dioxide test. Test tube of limewater with carbon dioxide gas being bubbled through. The limewater, a solution of calcium hydroxide in water, is turning milky. This is used as a test for the presence of carbon dioxide. The reaction between limewater and carbon dioxide produces calcium carbonate as a white solid (precipitate). The equation for the reaction is: CO2 + Ca(OH)2 ---> CaCO3 + H2O.

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Keywords: analysis, analytical, apparatus, aqueous solution, calcium carbonate, calcium hydroxide, carbon dioxide, chemical, chemicals, chemistry, cloudy, co2, demo, demonstration, experiment, gas, glassware, greenhouse gas, lesson, limewater, liquid, milky, positive, practical, precipitate, reacting, reaction, result, school, solid, test tube, testing

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