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You could bubble it through limewater. One of them will react to form a precipitate and the other won't.

They also smell different, though I wouldn't necessarily recommend that method.

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13y ago
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5mo ago

You can differentiate between CO2 and nitrogen by using chemical tests or analytical instruments such as a gas chromatograph. CO2 typically reacts with lime water (calcium hydroxide) to form a milky precipitate, while nitrogen does not have this reaction. In addition, you can identify CO2 by its acidic properties and ability to extinguish flames, which nitrogen does not exhibit.

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Q: How do you tell difference between co2 and nitrogen?
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