How to test the evolution of carbon dioxide gas in a chemical reaction
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browning of test tube or evolution of a gas through test tube
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Below is the answer.
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To test the presence or evolution of carbon dioxide gas in a chemical reaction many physical and chemical test can be carried out. The most common, easy and effective way to test its presence is by bubbling the gas through lime-water. That is done by using a diluted solution of slaked lime also called calcium hydroxide and passing the gas through it. If the gas is carbon dioxide then chalk will be formed i.e white precipitates of solid calcium carbonate will be seen in the solution.
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