How Do You Test for Carbon Dioxide?

Answer

In order to test for carbon dioxide, bubble the gas through limewater (saturated calcium hydroxide solution). Carbon dioxide reacts to form calcium carbonate, which turns the liquid cloudy.
2 Additional Answers
One can use lime water to test for Carbon Dioxide. Lime water will turn milky and cloudy in the presence of CO2.
Understanding the fact that carbon dioxide turns lime water cloudy, try to bubble the gas through lime water, and if in fact the limewater clouds up, carbon dioxide is present.
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