Question

experimentally how will you show that you breathe out carbon di oxide​

Answer 1

Answer:

carbon dioxide turns limewater milky

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Answer 2

Limewater can be used to detect carbon dioxide. If carbon dioxide is bubbled through limewater then it turns from clear to cloudy/milky in colour. This is why limewater used in a simple respirometer can show that more carbon dioxide is present in exhaled air compared to inhaled air.