Carbon dioxide test

Carbon dioxide test

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Credit: ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: Carbon dioxide test. Image 2 of 2. Test tube of limewater after a positive test for the presence of carbon dioxide gas (CO2). The CO2 has been passed through the limewater using the thin tube running down from top centre. The limewater is a solution of calcium hydroxide (Ca[OH]2) in water (H2O). As the gas was carbon dioxide, a chemical reaction occurred, producing calcium carbonate (CaCO3) as a white solid (precipitate). This has turned the clear limewater cloudy. The equation for the reaction is: CO2 + Ca(OH)2 ----> CaCO3 + H2O For the start of this test, see image A500/279.

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Keywords: analysis, analytical, apparatus, aqueous solution, ca(oh)2, caco3, calcium carbonate, calcium hydroxide, carbon dioxide, chemical, chemicals, chemistry, cloudy, co2, experiment, gas, glass, glassware, greenhouse gas, limewater, liquid, milky, positive, precipitate, reaction, result, solid, test tube, testing

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