Question

Hypothesis for the presence of carbon dioxide in exhaled air

Answer 1

Answer:  The Limewater Carbon Dioxide Test

We can test the presence of carbon dioxide in exhaled air by the following experiment :

⇒ Take a closed test tube filled with limewater

⇒ Now use a syringe to let in the atmospheric air , we will observe that the lime water turns slightly milky

⇒ Now use your moth to blow air from your mouth to another test tube filled with lime water

⇒ We will observe that the lime water turns milky and produces a precipitate of CaCO₃ (Calcium Carbonate)

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