HUMAN PHYSIOLOGY
BREATHING AND RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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test using cobalt chloride paper
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test using litmus paper
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test using limewater
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test using lighted splinter
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Detailed explanation-1: -Calcium hydroxide (chemical name for limewater) reacts with carbon dioxide in the exhaled air to form calcium carbonate which is insoluble in water and thus forms a milky white precipitate.
Detailed explanation-2: -Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white.
Detailed explanation-3: -Thus, the lime water experiment is used to detect the presence of carbon dioxide in the exhaled air.
Detailed explanation-4: -Limewater is a calcium hydroxide solution that produces a white precipitate of calcium carbonate when it reacts with carbon dioxide. The white precipitate can be easily detected by the person conducting the experiment. Due to this fact, you will often see that limewater is used to detect the presence of carbon dioxide.