Name the chemical used to test the presence of CO2 in exhaled air. [1 MARK]

Question

Name the chemical used to test the presence of

C O_{2}

in exhaled air. [1 MARK]

Answer:
:
Calcium hydroxide (chemical name forlimewater) reacts withcarbon dioxide in the exhaled air to form calcium carbonate which is insoluble in water and thus forms a milky white precipitate.

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